Complete editor operator invariants

.cursor/plans/operator_invariants_completion_2026-07-12.plan.md

@@ -0,0 +1,33 @@
+# Operator Invariants Completion
+
+Working plan for Gitea
+[`#33`](https://git.spacetrainclubhouse.com/Falling-Metal-Interactive/Blacksite/issues/33).
+
+## Status
+
+Implementation complete. Source and headless gates pass on the publication branch; the final exact
+commit is recorded in the issue closure comment. Packaged-runtime testing remains deferred by the
+project owner.
+
+## Scope
+
+1. Make registered commands distinguish immediate completion from modal Preview ownership.
+2. Require stable operator IDs and terminal phases for commit, cancel, block, failure, no-op, and
+   automatic interruption paths.
+3. Make Group Selection and lighting changes atomic history transactions with repeatable undo/redo.
+4. Exercise production dispatch/finalizers for assets, material drops, brushes, terrain, physics
+   placement, and transform gizmos through reusable semantic projections.
+5. Publish the invariant contract, acceptance evidence, and production-gate status without claiming
+   release-candidate acceptance.
+
+## Verification
+
+- `cargo test -p editor --lib --no-fail-fast`
+- `cargo clippy -p editor --lib --tests -- -D warnings`
+- `cargo fmt --all -- --check`
+- `cargo test --workspace --all-targets --no-fail-fast`
+- `cargo clippy --workspace --all-targets -- -D warnings`
+- `cargo validate-levels --project .`
+
+Live editor checks cover command-palette modal ownership and the grouped selection/lighting history
+surface. Packaged tests are deliberately excluded until re-enabled by the project owner.

.cursor/plans/production_readiness_acceptance_2026-07-12.plan.md

@@ -15,12 +15,12 @@ owner requests it again.
 
 1. Keep one evidence matrix under `docs/editor/evaluations/production-readiness/`; historical H1-H6
    notes remain context only.
-2. Close implementation blockers before nominating a candidate: the deformed Solari geometry
+2. Close implementation blockers before nominating a candidate. Renderer foundation `#51`, terrain
-   boundary in `#51`, terrain `#22`-`#24`, physics placement/diagnostics `#25`-`#26`, and their
+   `#22`-`#24`, physics placement/diagnostics `#25`-`#26`, operator invariants `#33`, collaborative
-   regression fixtures. Collaborative safety `#49`, Material Library/targeted drops `#16`/`#18`,
+   safety `#49`, Material Library/targeted drops `#16`/`#18`, and native-dialog responsiveness `#52`
-   and native-dialog responsiveness `#52` are accepted and integrated.
+   are accepted and integrated.
-3. Complete the representative regression project, mutation-invariant coverage, performance budgets,
+3. Complete the representative regression project, performance budgets, and first-hour workflow
-   and first-hour workflow tracked by `#32`-`#36`.
+   tracked by `#32`, `#34`, `#35`, and `#36`.
 4. Nominate one exact commit, validate it from a clean checkout, and record source/headless results.
 5. When packaged testing is re-enabled, run the candidate's package/build and packaged-runtime
    matrix without substituting older artifacts.

README.md

@@ -419,7 +419,7 @@ crates/
 - [x] CI workflow for format, check, clippy, tests, and binary builds
 - [x] ADRs for roadmap architecture and Bevy migration policy
 - [x] Determinism harness: same inputs over same ticks produce the same state summary/hash
-- [x] Reusable editor operator harness for commit/cancel/block, helper cleanup, dirty state, grouped undo, and undo/redo round trips
+- [x] Production operator invariants across palette dispatch, assets/material drops, brush/terrain/physics modal tools, grouping/lighting, and the transform finalizer: stable terminal status, exact cancel/failure rollback, helper cleanup, grouped history, and repeated undo/redo projections ([testing contract](docs/editor/operator-regression-testing.md), [evaluation](docs/editor/evaluations/operator-invariants/), [Gitea #33](https://git.spacetrainclubhouse.com/Falling-Metal-Interactive/Blacksite/issues/33))
 - [x] Verify: `cargo fmt --check` / `cargo check --workspace` / `cargo clippy --workspace` / strict foundation clippy / `cargo test -p sim`
 - [x] Stable asset registry with UUIDs + import settings in asset browser details
 - [x] Asset Browser expandable model subasset shelves, independent mesh/material/texture thumbnails, staged import/material details with shader-schema parameters, context actions, and trash-first file removal

crates/editor/src/assets/operators.rs

@@ -469,6 +469,86 @@ mod tests {
         );
     }
 
+    #[test]
+    fn multi_actor_material_assignment_is_one_undo_group() {
+        let mut world = World::new();
+        world.init_resource::<ActiveOperator>();
+        world.init_resource::<EditorHistory>();
+        world.init_resource::<SceneIo>();
+        let material_path = std::env::temp_dir().join(format!(
+            "blacksite-material-operator-{}.material.ron",
+            uuid::Uuid::new_v4()
+        ));
+        let fixture = shared::MaterialAsset {
+            schema_version: shared::MATERIAL_ASSET_SCHEMA_VERSION,
+            label: "Concrete".into(),
+            shader: None,
+            shader_ref: None,
+            render_state: Default::default(),
+            material: MaterialDesc {
+                roughness: 0.85,
+                ..Default::default()
+            },
+        };
+        std::fs::write(
+            &material_path,
+            ron::ser::to_string_pretty(&fixture, ron::ser::PrettyConfig::default()).unwrap(),
+        )
+        .unwrap();
+        let material_path = material_path.to_string_lossy().into_owned();
+        world.insert_resource(AssetRegistry {
+            records: vec![AssetRecord {
+                id: AssetId::new(),
+                path: material_path.clone(),
+                label: "Concrete".into(),
+                kind_tag: "Material".into(),
+                import_settings: Default::default(),
+                dependencies: Vec::new(),
+            }],
+            index_dirty: false,
+        });
+        let first = world.spawn((LevelObject, MaterialDesc::default())).id();
+        let second = world.spawn((LevelObject, MaterialDesc::default())).id();
+        let mut selected = SelectedEntities::default();
+        selected.select_replace(first);
+        selected.select_maybe_add(second, true);
+        let asset = EditorAsset {
+            label: "Concrete".to_string(),
+            path: Some(material_path.clone()),
+            folder_path: "assets/materials".to_string(),
+            kind: super::super::EditorAssetKind::Material,
+        };
+        super::super::materials::material_desc_from_asset(&material_path)
+            .expect("committed material fixture should resolve");
+        let harness = OperatorInvariantHarness::capture(&mut world);
+        let read_materials = move |world: &mut World| {
+            [first, second]
+                .into_iter()
+                .map(|entity| {
+                    world
+                        .get::<MaterialDesc>(entity)
+                        .and_then(|material| material.material_asset_path.clone())
+                })
+                .collect::<Vec<_>>()
+        };
+
+        let applied = apply_material_operator(&mut world, asset, &selected);
+        assert!(
+            applied,
+            "material operator failed: {:?}",
+            world.resource::<ActiveOperator>().status
+        );
+
+        harness.assert_committed(&mut world, 1, 0);
+        assert_undo_redo_round_trip(
+            &mut world,
+            vec![None, None],
+            vec![Some(material_path.clone()), Some(material_path.clone())],
+            read_materials,
+        );
+        let _ = std::fs::remove_file(material_path);
+    }
+
     #[test]
     fn missing_subasset_commit_cancels_without_side_effects() {
         let mut world = World::new();
@@ -533,4 +613,59 @@ mod tests {
 
         harness.assert_blocked(&mut world);
     }
+
+    #[test]
+    fn material_assignment_without_authored_selection_is_blocked() {
+        let mut world = World::new();
+        world.init_resource::<ActiveOperator>();
+        world.init_resource::<EditorHistory>();
+        world.init_resource::<SceneIo>();
+        let harness = OperatorInvariantHarness::capture(&mut world);
+        let asset = EditorAsset {
+            label: "Concrete".to_string(),
+            path: Some("assets/materials/concrete.ron".to_string()),
+            folder_path: "assets/materials".to_string(),
+            kind: super::super::EditorAssetKind::Material,
+        };
+
+        assert!(!apply_material_operator(
+            &mut world,
+            asset,
+            &SelectedEntities::default()
+        ));
+
+        harness.assert_blocked(&mut world);
+    }
+
+    #[test]
+    fn audio_and_animation_assignment_reject_incompatible_actors() {
+        let mut world = World::new();
+        world.init_resource::<ActiveOperator>();
+        world.init_resource::<EditorHistory>();
+        world.init_resource::<SceneIo>();
+        let entity = world.spawn(LevelObject).id();
+        let audio = EditorAsset {
+            label: "Impact".into(),
+            path: Some("assets/audio/impact.ogg".into()),
+            folder_path: "assets/audio".into(),
+            kind: super::super::EditorAssetKind::AudioClip,
+        };
+        let audio_harness = OperatorInvariantHarness::capture(&mut world);
+
+        assert!(!assign_audio_clip_operator(&mut world, audio, entity));
+        audio_harness.assert_blocked(&mut world);
+
+        let animation_harness = OperatorInvariantHarness::capture(&mut world);
+        let selection = AssetSelection::SubAsset {
+            parent_path: "assets/models/missing.glb".into(),
+            sub_asset_id: "animation:missing".into(),
+            label: "Missing".into(),
+            kind: super::super::AssetSubAssetKind::AnimationClip,
+            source_path: None,
+        };
+        assert!(!assign_animation_clip_operator(
+            &mut world, selection, entity
+        ));
+        animation_harness.assert_blocked(&mut world);
+    }
 }

crates/editor/src/ext/extensibility.rs

@@ -4,7 +4,7 @@ use bevy::prelude::*;
 use bevy_egui::{egui, EguiContexts, EguiPrimaryContextPass};
 
 use crate::history::group_selection_with_history;
-use crate::operators::{run_immediate_operator, OperatorAvailability};
+use crate::operators::{run_operator_action, OperatorAction, OperatorAvailability};
 use crate::state::{EditorMode, PlayPossession};
 use crate::ui::helpers::{
     reset_scene_lighting_to_project_defaults, toggle_play_mode, toggle_play_paused,
@@ -27,7 +27,7 @@ pub trait EditorCommand: Send + Sync {
     fn disabled_reason(&self, _world: &World) -> Option<String> {
         None
     }
-    fn execute(&self, world: &mut World);
+    fn execute(&self, world: &mut World) -> Result<OperatorAction, String>;
 }
 
 #[derive(Resource, Default)]
@@ -70,13 +70,11 @@ impl EditorCommandRegistry {
             .map(|cmd| (cmd.label().to_string(), cmd.disabled_reason(world)))
     }
 
-    pub fn run(&self, world: &mut World, name: &str) -> bool {
+    pub fn run(&self, world: &mut World, name: &str) -> Option<Result<OperatorAction, String>> {
-        if let Some(command) = self.commands.iter().find(|cmd| cmd.name() == name) {
+        self.commands
-            command.execute(world);
+            .iter()
-            true
+            .find(|command| command.name() == name)
-        } else {
+            .map(|command| command.execute(world))
-            false
-        }
     }
 }
 
@@ -191,6 +189,10 @@ pub fn register_editor_plugin(app: &mut App, plugin: Box<dyn EditorPlugin>) {
 }
 
 fn register_builtin_commands(mut registry: ResMut<EditorCommandRegistry>) {
+    populate_builtin_commands(&mut registry);
+}
+
+fn populate_builtin_commands(registry: &mut EditorCommandRegistry) {
     registry.register(Box::new(TogglePlayCommand));
     registry.register(Box::new(TogglePlayPausedCommand));
     registry.register(Box::new(TogglePossessionCommand));
@@ -235,7 +237,7 @@ fn dispatch_editor_command(world: &mut World, name: &str) {
     let name_for_commit = name.to_string();
     let name_for_status = name.to_string();
     let label_for_commit = label.clone();
-    run_immediate_operator(
+    run_operator_action(
         world,
         &name_for_status,
         &label,
@@ -244,14 +246,10 @@ fn dispatch_editor_command(world: &mut World, name: &str) {
             None => OperatorAvailability::Ready,
         },
         move |world| {
-            let ran = world.resource_scope(|world, registry: Mut<EditorCommandRegistry>| {
+            let result = world.resource_scope(|world, registry: Mut<EditorCommandRegistry>| {
                 registry.run(world, &name_for_commit)
             });
-            if ran {
+            result.unwrap_or_else(|| Err(format!("Unknown editor command: {name_for_commit}")))
-                Ok(())
-            } else {
-                Err(format!("Unknown editor command: {name_for_commit}"))
-            }
         },
     );
 
@@ -269,8 +267,9 @@ impl EditorCommand for TogglePlayCommand {
         "Toggle Play / Edit"
     }
 
-    fn execute(&self, world: &mut World) {
+    fn execute(&self, world: &mut World) -> Result<OperatorAction, String> {
         toggle_play_mode(world);
+        Ok(OperatorAction::Commit)
     }
 }
 
@@ -290,8 +289,9 @@ impl EditorCommand for TogglePlayPausedCommand {
             .then(|| "Enter Play mode before pausing the simulation".to_string())
     }
 
-    fn execute(&self, world: &mut World) {
+    fn execute(&self, world: &mut World) -> Result<OperatorAction, String> {
         toggle_play_paused(world);
+        Ok(OperatorAction::Commit)
     }
 }
 
@@ -311,12 +311,13 @@ impl EditorCommand for TogglePossessionCommand {
             .then(|| "Enter Play mode before toggling possession".to_string())
     }
 
-    fn execute(&self, world: &mut World) {
+    fn execute(&self, world: &mut World) -> Result<OperatorAction, String> {
         let next = match *world.resource::<PlayPossession>() {
             PlayPossession::Possessed => PlayPossession::Ejected,
             PlayPossession::Ejected => PlayPossession::Possessed,
         };
         *world.resource_mut::<PlayPossession>() = next;
+        Ok(OperatorAction::Commit)
     }
 }
 
@@ -331,8 +332,9 @@ impl EditorCommand for ResetLightingCommand {
         "Reset Scene Lighting"
     }
 
-    fn execute(&self, world: &mut World) {
+    fn execute(&self, world: &mut World) -> Result<OperatorAction, String> {
         reset_scene_lighting_to_project_defaults(world);
+        Ok(OperatorAction::Commit)
     }
 }
 
@@ -347,13 +349,23 @@ impl EditorCommand for GroupSelectionCommand {
         "Group Selection"
     }
 
-    fn execute(&self, world: &mut World) {
+    fn disabled_reason(&self, world: &World) -> Option<String> {
+        world
+            .resource::<UiState>()
+            .selected_entities
+            .as_slice()
+            .is_empty()
+            .then(|| "Select at least one actor to group".to_string())
+    }
+
+    fn execute(&self, world: &mut World) -> Result<OperatorAction, String> {
         let selected: Vec<Entity> = world
             .resource::<UiState>()
             .selected_entities
             .iter()
             .collect();
         group_selection_with_history(world, &selected);
+        Ok(OperatorAction::Commit)
     }
 }
 
@@ -368,8 +380,9 @@ impl EditorCommand for FocusSelectionCommand {
         "Focus Selection"
     }
 
-    fn execute(&self, world: &mut World) {
+    fn execute(&self, world: &mut World) -> Result<OperatorAction, String> {
         focus_editor_camera_on_selection(world);
+        Ok(OperatorAction::Commit)
     }
 }
 
@@ -384,8 +397,9 @@ impl EditorCommand for ResetSelectionTransformCommand {
         "Reset Selection Transform"
     }
 
-    fn execute(&self, world: &mut World) {
+    fn execute(&self, world: &mut World) -> Result<OperatorAction, String> {
         reset_selected_transforms(world);
+        Ok(OperatorAction::Commit)
     }
 }
 
@@ -405,8 +419,9 @@ impl EditorCommand for DrawBrushCommand {
             .then(|| "Enter Edit mode before drawing brushes".to_string())
     }
 
-    fn execute(&self, world: &mut World) {
+    fn execute(&self, world: &mut World) -> Result<OperatorAction, String> {
         start_draw_brush_tool(world);
+        Ok(OperatorAction::ContinuePreview)
     }
 }
 
@@ -425,8 +440,9 @@ impl EditorCommand for IntersectBrushesCommand {
         (selected_brush_count(world) < 2).then(|| "Select at least two brushes".to_string())
     }
 
-    fn execute(&self, world: &mut World) {
+    fn execute(&self, world: &mut World) -> Result<OperatorAction, String> {
-        intersect_selected_brushes(world);
+        intersect_selected_brushes(world)?;
+        Ok(OperatorAction::ContinuePreview)
     }
 }
 
@@ -445,8 +461,9 @@ impl EditorCommand for MergeBrushesCommand {
         (selected_brush_count(world) < 2).then(|| "Select at least two brushes".to_string())
     }
 
-    fn execute(&self, world: &mut World) {
+    fn execute(&self, world: &mut World) -> Result<OperatorAction, String> {
-        merge_selected_brushes(world);
+        merge_selected_brushes(world)?;
+        Ok(OperatorAction::ContinuePreview)
     }
 }
 
@@ -465,8 +482,9 @@ impl EditorCommand for SubtractBrushesCommand {
         (selected_brush_count(world) < 2).then(|| "Select at least two brushes".to_string())
     }
 
-    fn execute(&self, world: &mut World) {
+    fn execute(&self, world: &mut World) -> Result<OperatorAction, String> {
-        subtract_selected_brushes(world);
+        subtract_selected_brushes(world)?;
+        Ok(OperatorAction::ContinuePreview)
     }
 }
 
@@ -481,8 +499,9 @@ impl EditorCommand for CreatePostProcessVolumeCommand {
         "Create Post-process Volume"
     }
 
-    fn execute(&self, world: &mut World) {
+    fn execute(&self, world: &mut World) -> Result<OperatorAction, String> {
         crate::rendering_diagnostics::spawn_post_process_volume_at_camera(world);
+        Ok(OperatorAction::Commit)
     }
 }
 
@@ -497,9 +516,10 @@ impl EditorCommand for FocusActiveVolumesCommand {
         "Focus Active Post-process Volumes"
     }
 
-    fn execute(&self, world: &mut World) {
+    fn execute(&self, world: &mut World) -> Result<OperatorAction, String> {
         crate::rendering_diagnostics::select_volumes_at_camera(world);
         focus_editor_camera_on_selection(world);
+        Ok(OperatorAction::Commit)
     }
 }
 
@@ -514,8 +534,9 @@ impl EditorCommand for SelectVolumesAtCameraCommand {
         "Select Volumes at Camera"
     }
 
-    fn execute(&self, world: &mut World) {
+    fn execute(&self, world: &mut World) -> Result<OperatorAction, String> {
         crate::rendering_diagnostics::select_volumes_at_camera(world);
+        Ok(OperatorAction::Commit)
     }
 }
 
@@ -671,6 +692,53 @@ fn command_palette_row(entry: &EditorCommandEntry) -> egui::WidgetText {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use crate::history::{apply_command_redo, apply_command_undo, EditorHistory};
+    use crate::operators::test_harness::OperatorInvariantHarness;
+    use crate::operators::{ActiveOperator, OperatorPhase};
+    use crate::scene_io::SceneIo;
+    use crate::selection::{SelectedEntity, ViewportClick};
+    use crate::viewport::brush_tool::BrushToolState;
+    use shared::{
+        ActorKind, AuthoringLightKind, BrushDesc, EditorVisibility, HierarchySiblingIndex,
+        LevelObject, LightDesc,
+    };
+
+    fn command_world() -> World {
+        let mut world = World::new();
+        world.init_resource::<ActiveOperator>();
+        world.init_resource::<EditorHistory>();
+        world.init_resource::<SceneIo>();
+        world.init_resource::<SelectedEntity>();
+        world.init_resource::<ViewportClick>();
+        world.init_resource::<BrushToolState>();
+        world.init_resource::<crate::viewport::brush_csg::BrushCsgPreview>();
+        world.insert_resource(State::new(EditorMode::Editing));
+        world.insert_resource(UiState::default_layout());
+        let mut registry = EditorCommandRegistry::default();
+        populate_builtin_commands(&mut registry);
+        world.insert_resource(registry);
+        world
+    }
+
+    fn hierarchy_projection(world: &mut World) -> Vec<(String, Option<String>, i32)> {
+        let mut query = world.query_filtered::<(Entity, &Name), With<LevelObject>>();
+        let mut result = query
+            .iter(world)
+            .map(|(entity, name)| {
+                let parent = world
+                    .get::<ChildOf>(entity)
+                    .and_then(|child| world.get::<Name>(child.parent()))
+                    .map(|name| name.as_str().to_string());
+                let sibling_index = world
+                    .get::<HierarchySiblingIndex>(entity)
+                    .map(|index| index.0)
+                    .unwrap_or_default();
+                (name.as_str().to_string(), parent, sibling_index)
+            })
+            .collect::<Vec<_>>();
+        result.sort();
+        result
+    }
 
     #[test]
     fn command_filter_matches_human_label_and_stable_id() {
@@ -697,4 +765,208 @@ mod tests {
         assert_eq!(entries[0].name, "play.toggle");
         assert_eq!(entries[1].name, "scene.reset_lighting");
     }
+
+    #[test]
+    fn grouping_dispatch_is_one_history_transaction_and_round_trips() {
+        let mut world = command_world();
+        let first = world
+            .spawn((
+                Name::new("First"),
+                LevelObject,
+                ActorKind::Empty,
+                Transform::from_xyz(1.0, 0.0, 0.0),
+                GlobalTransform::default(),
+                HierarchySiblingIndex(0),
+                EditorVisibility::default(),
+            ))
+            .id();
+        let second = world
+            .spawn((
+                Name::new("Second"),
+                LevelObject,
+                ActorKind::Empty,
+                Transform::from_xyz(2.0, 0.0, 0.0),
+                GlobalTransform::default(),
+                HierarchySiblingIndex(1),
+                EditorVisibility::default(),
+            ))
+            .id();
+        let unselected = world
+            .spawn((
+                Name::new("Unselected"),
+                LevelObject,
+                ActorKind::Empty,
+                Transform::from_xyz(3.0, 0.0, 0.0),
+                GlobalTransform::default(),
+                HierarchySiblingIndex(2),
+                EditorVisibility::default(),
+            ))
+            .id();
+        world
+            .resource_mut::<UiState>()
+            .selected_entities
+            .select_replace(first);
+        world
+            .resource_mut::<UiState>()
+            .selected_entities
+            .select_maybe_add(second, true);
+        let initial = hierarchy_projection(&mut world);
+        let harness = OperatorInvariantHarness::capture(&mut world);
+
+        dispatch_editor_command(&mut world, "selection.group");
+
+        harness.assert_committed(&mut world, 1, 1);
+        harness.assert_status(&world, "selection.group", OperatorPhase::Committed);
+        let committed = hierarchy_projection(&mut world);
+        assert!(committed
+            .iter()
+            .any(|(name, parent, _)| name == "First" && parent.as_deref() == Some("Group")));
+        assert!(committed
+            .iter()
+            .any(|(name, parent, _)| name == "Second" && parent.as_deref() == Some("Group")));
+        apply_command_undo(&mut world);
+        assert_eq!(hierarchy_projection(&mut world), initial);
+        apply_command_redo(&mut world);
+        assert_eq!(hierarchy_projection(&mut world), committed);
+        assert!(world.get::<ChildOf>(unselected).is_none());
+        apply_command_undo(&mut world);
+        assert_eq!(hierarchy_projection(&mut world), initial);
+        apply_command_redo(&mut world);
+        assert_eq!(hierarchy_projection(&mut world), committed);
+        assert!(world.get::<ChildOf>(unselected).is_none());
+    }
+
+    #[test]
+    fn reset_lighting_dispatch_is_one_undoable_group() {
+        let mut world = command_world();
+        let point = world
+            .spawn((
+                LevelObject,
+                ActorKind::Light,
+                LightDesc {
+                    kind: AuthoringLightKind::Point,
+                    ..Default::default()
+                },
+            ))
+            .id();
+        let directional = world
+            .spawn((
+                LevelObject,
+                ActorKind::Light,
+                LightDesc {
+                    kind: AuthoringLightKind::Directional,
+                    ..Default::default()
+                },
+            ))
+            .id();
+        let harness = OperatorInvariantHarness::capture(&mut world);
+
+        dispatch_editor_command(&mut world, "scene.reset_lighting");
+
+        harness.assert_committed(&mut world, 1, 0);
+        harness.assert_status(&world, "scene.reset_lighting", OperatorPhase::Committed);
+        assert!(world.get::<LightDesc>(point).is_none());
+        assert!(world.get::<LightDesc>(directional).is_none());
+        apply_command_undo(&mut world);
+        assert!(world.get::<LightDesc>(point).is_some());
+        assert!(world.get::<LightDesc>(directional).is_some());
+        apply_command_redo(&mut world);
+        assert!(world.get::<LightDesc>(point).is_none());
+        assert!(world.get::<LightDesc>(directional).is_none());
+    }
+
+    #[test]
+    fn modal_command_dispatch_retains_preview_ownership() {
+        let mut world = command_world();
+        let harness = OperatorInvariantHarness::capture(&mut world);
+
+        dispatch_editor_command(&mut world, "brush.draw");
+
+        harness.assert_status(&world, "brush.draw", OperatorPhase::Preview);
+        harness.assert_projection_unchanged(&mut world, 0, |world| {
+            world.resource::<EditorHistory>().undo_depth()
+        });
+        assert!(!world.resource::<SceneIo>().dirty);
+        assert!(world.resource::<BrushToolState>().active);
+    }
+
+    #[test]
+    fn failed_csg_dispatch_terminates_without_preview_or_history() {
+        let mut world = command_world();
+        let first = world
+            .spawn((
+                LevelObject,
+                BrushDesc::cuboid(Vec3::splat(1.0)),
+                Transform::IDENTITY,
+            ))
+            .id();
+        let mut invalid = BrushDesc::cuboid(Vec3::splat(1.0));
+        invalid.faces.clear();
+        let second = world
+            .spawn((LevelObject, invalid, Transform::IDENTITY))
+            .id();
+        world
+            .resource_mut::<UiState>()
+            .selected_entities
+            .select_replace(first);
+        world
+            .resource_mut::<UiState>()
+            .selected_entities
+            .select_maybe_add(second, true);
+        let harness = OperatorInvariantHarness::capture(&mut world);
+
+        dispatch_editor_command(&mut world, "brush.intersect");
+
+        harness.assert_canceled(&mut world);
+        harness.assert_status(&world, "brush.intersect", OperatorPhase::Canceled);
+        assert!(!world.resource::<SceneIo>().dirty);
+    }
+
+    #[test]
+    fn csg_dispatch_blocks_read_only_selection_without_history() {
+        let mut world = command_world();
+        let first = world
+            .spawn((
+                LevelObject,
+                BrushDesc::cuboid(Vec3::splat(1.0)),
+                Transform::IDENTITY,
+            ))
+            .id();
+        let second = world
+            .spawn((
+                LevelObject,
+                BrushDesc::cuboid(Vec3::splat(1.0)),
+                Transform::from_xyz(0.5, 0.0, 0.0),
+            ))
+            .id();
+        let mut hierarchy = crate::ui::hierarchy_state::HierarchyPanelState::default();
+        hierarchy.locked.insert(second);
+        world.insert_resource(hierarchy);
+        world
+            .resource_mut::<UiState>()
+            .selected_entities
+            .select_replace(first);
+        world
+            .resource_mut::<UiState>()
+            .selected_entities
+            .select_maybe_add(second, true);
+        let harness = OperatorInvariantHarness::capture(&mut world);
+
+        dispatch_editor_command(&mut world, "brush.merge_convex");
+
+        harness.assert_blocked(&mut world);
+        harness.assert_status(&world, "brush.merge_convex", OperatorPhase::Blocked);
+        assert!(!world.resource::<SceneIo>().dirty);
+    }
+
+    #[test]
+    fn disabled_command_dispatch_is_a_blocked_no_op() {
+        let mut world = command_world();
+        let harness = OperatorInvariantHarness::capture(&mut world);
+
+        dispatch_editor_command(&mut world, "selection.group");
+
+        harness.assert_blocked(&mut world);
+        harness.assert_status(&world, "selection.group", OperatorPhase::Blocked);
+    }
 }

crates/editor/src/history/commands.rs

@@ -106,6 +106,11 @@ pub struct PrefabEditState {
 
 #[derive(Debug, Clone)]
 pub enum EditorCommand {
+    GroupSelection {
+        snapshot: EditorEntitySnapshot,
+        group: Option<Entity>,
+        changes: Vec<SiblingChange>,
+    },
     Spawn {
         snapshot: EditorEntitySnapshot,
         entity: Option<Entity>,
@@ -152,6 +157,12 @@ pub enum EditorCommand {
         old: Option<LightDesc>,
         new: LightDesc,
     },
+    SetLightGroup {
+        entities: Vec<Entity>,
+        olds: Vec<Option<LightDesc>>,
+        news: Vec<Option<LightDesc>>,
+        label: &'static str,
+    },
     SetAnimationController {
         entity: Entity,
         old: Option<AnimationControllerDesc>,
@@ -293,6 +304,7 @@ pub enum EditorCommand {
 impl EditorCommand {
     pub fn label(&self) -> &'static str {
         match self {
+            EditorCommand::GroupSelection { .. } => "Group Selection",
             EditorCommand::Spawn { .. } => "Spawn",
             EditorCommand::SpawnMany { .. } => "Spawn Brushes",
             EditorCommand::Despawn { .. } => "Delete",
@@ -303,6 +315,7 @@ impl EditorCommand {
             EditorCommand::SetMaterialGroup { .. } => "Apply Material to Selection",
             EditorCommand::SetMaterialOverride { .. } => "Set Material Override",
             EditorCommand::SetLight { .. } => "Set Light",
+            EditorCommand::SetLightGroup { label, .. } => label,
             EditorCommand::SetAnimationController { .. } => "Set Animation Controller",
             EditorCommand::SetAudioSource { .. } => "Set Audio Source",
             EditorCommand::SetAudioListener { .. } => "Set Audio Listener",

crates/editor/src/history/mod.rs

@@ -17,6 +17,7 @@ use shared::{
     TriggerVolume, WeaponSpawn,
 };
 
+use crate::operators::{ActiveOperator, OperatorPhase, OperatorStatus};
 use crate::scene_io::{SceneIo, SceneIoRequest};
 use crate::selection::SelectedEntity;
 use crate::state::scene_tools_active;
@@ -560,6 +561,40 @@ pub fn set_light_with_history(world: &mut World, entity: Entity, new: LightDesc)
     push_history(world, EditorCommand::SetLight { entity, old, new });
 }
 
+pub fn set_light_group_with_history(
+    world: &mut World,
+    changes: impl IntoIterator<Item = (Entity, Option<LightDesc>)>,
+    label: &'static str,
+) {
+    let mut entities = Vec::new();
+    let mut olds = Vec::new();
+    let mut news = Vec::new();
+    for (entity, new) in changes {
+        if !is_mutable_level_object(world, entity) {
+            continue;
+        }
+        let old = world.get::<LightDesc>(entity).cloned();
+        if old.is_none() && new.is_none() {
+            continue;
+        }
+        apply_light(world, entity, &new);
+        entities.push(entity);
+        olds.push(old);
+        news.push(new);
+    }
+    if !entities.is_empty() {
+        push_history(
+            world,
+            EditorCommand::SetLightGroup {
+                entities,
+                olds,
+                news,
+                label,
+            },
+        );
+    }
+}
+
 pub fn set_audio_source_with_history(world: &mut World, entity: Entity, new: AudioSourceDesc) {
     if !is_mutable_level_object(world, entity) {
         return;
@@ -752,9 +787,13 @@ pub fn apply_brush_csg_with_history(
     new_transform: Transform,
     new_brush: BrushDesc,
     delete_entities: &[Entity],
-) {
+) -> bool {
-    if !is_level_object(world, primary) {
+    if !is_mutable_level_object(world, primary)
-        return;
+        || delete_entities
+            .iter()
+            .any(|entity| !is_mutable_level_object(world, *entity))
+    {
+        return false;
     }
     let old_transform = world.get::<Transform>(primary).copied().unwrap_or_default();
     let old_brush = world.get::<BrushDesc>(primary).cloned();
@@ -769,7 +808,7 @@ pub fn apply_brush_csg_with_history(
         && old_brush.as_ref() == Some(&new_brush)
         && deleted.is_empty()
     {
-        return;
+        return false;
     }
     if let Ok(mut entity_mut) = world.get_entity_mut(primary) {
         entity_mut.insert(new_transform);
@@ -790,6 +829,7 @@ pub fn apply_brush_csg_with_history(
         },
     );
     select_one(world, primary);
+    true
 }
 
 pub fn set_static_mesh_renderer_with_history(
@@ -943,14 +983,16 @@ pub fn group_selection_with_history(world: &mut World, entities: &[Entity]) {
         children: Vec::new(),
     };
     let group = spawn_snapshot(world, &snapshot);
+    let changes = reorder_entities_under_parent(world, &entities, Some(group), i32::MAX);
     push_history(
         world,
-        EditorCommand::Spawn {
+        EditorCommand::GroupSelection {
             snapshot,
-            entity: Some(group),
+            group: Some(group),
+            changes,
         },
     );
-    reorder_siblings_with_history(world, &entities, Some(group), i32::MAX);
+    select_one(world, group);
 }
 
 pub fn create_empty_child_with_history(world: &mut World, parent: Entity) {
@@ -1637,6 +1679,13 @@ fn prepare_prefab_source_history(
 
 fn undo_command(world: &mut World, command: &mut EditorCommand) {
     match command {
+        EditorCommand::GroupSelection { group, changes, .. } => {
+            for change in changes.iter().rev() {
+                apply_sibling_change(world, change);
+            }
+            despawn_entity(world, *group);
+            clear_selection(world);
+        }
         EditorCommand::Spawn { entity, .. } => {
             despawn_entity(world, entity.take());
             clear_selection(world);
@@ -1682,6 +1731,11 @@ fn undo_command(world: &mut World, command: &mut EditorCommand) {
         EditorCommand::SetLight { entity, old, .. } => {
             apply_light(world, *entity, old);
         }
+        EditorCommand::SetLightGroup { entities, olds, .. } => {
+            for (entity, old) in entities.iter().zip(olds.iter()) {
+                apply_light(world, *entity, old);
+            }
+        }
         EditorCommand::SetAnimationController { entity, old, .. } => {
             apply_animation_controller(world, *entity, old);
         }
@@ -1818,6 +1872,25 @@ fn undo_command(world: &mut World, command: &mut EditorCommand) {
 
 fn redo_command(world: &mut World, command: &mut EditorCommand) {
     match command {
+        EditorCommand::GroupSelection {
+            snapshot,
+            group,
+            changes,
+        } => {
+            let previous_group = *group;
+            let spawned = spawn_snapshot(world, snapshot);
+            *group = Some(spawned);
+            for change in changes.iter_mut() {
+                if Some(change.entity) == previous_group {
+                    change.entity = spawned;
+                }
+                if change.new_parent == previous_group {
+                    change.new_parent = Some(spawned);
+                }
+                apply_sibling_change_new(world, change);
+            }
+            select_one(world, spawned);
+        }
         EditorCommand::Spawn { snapshot, entity } => {
             let spawned = spawn_snapshot(world, snapshot);
             *entity = Some(spawned);
@@ -1881,6 +1954,11 @@ fn redo_command(world: &mut World, command: &mut EditorCommand) {
                 entity_mut.insert(new.clone());
             }
         }
+        EditorCommand::SetLightGroup { entities, news, .. } => {
+            for (entity, new) in entities.iter().zip(news.iter()) {
+                apply_light(world, *entity, new);
+            }
+        }
         EditorCommand::SetAnimationController { entity, new, .. } => {
             if let Ok(mut entity_mut) = world.get_entity_mut(*entity) {
                 entity_mut.insert(new.clone());
@@ -2614,16 +2692,22 @@ fn capture_gizmo_transform_edits(world: &mut World) {
     let start_group =
         active.map(|(entity, transform)| selected_transforms(world, &selection, entity, transform));
 
+    let mut started_edit = false;
     let (finished_edit, live_edit) = {
         let mut tracker = world.resource_mut::<TransformEditTracker>();
         if tracker.active.is_none() {
             if let (Some((entity, transform)), Some(group)) = (active, start_group) {
                 tracker.active = Some((entity, transform, group));
-                return;
+                started_edit = true;
             }
         }
+        if started_edit {
+            (None, None)
+        } else {
             match tracker.active.take() {
-            Some((primary, old, group)) if active.is_none() => (Some((primary, old, group)), None),
+                Some((primary, old, group)) if active.is_none() => {
+                    (Some((primary, old, group)), None)
+                }
                 Some(state) if active.is_some() => {
                     let live = Some(state.clone());
                     tracker.active = Some(state);
@@ -2631,8 +2715,18 @@ fn capture_gizmo_transform_edits(world: &mut World) {
                 }
                 _ => (None, None),
             }
+        }
     };
 
+    if started_edit {
+        set_transform_operator_status(
+            world,
+            OperatorPhase::Preview,
+            "Transform gizmo drag in progress",
+        );
+        return;
+    }
+
     if let Some((primary, old_primary, group)) = live_edit {
         let Some(new_primary) = world.get::<Transform>(primary).copied() else {
             return;
@@ -2645,15 +2739,51 @@ fn capture_gizmo_transform_edits(world: &mut World) {
 
     if let Some((primary, old_primary, group)) = finished_edit {
         let Some(new_primary) = world.get::<Transform>(primary).copied() else {
+            for (entity, old) in group {
+                if let Some(mut transform) = world.get_mut::<Transform>(entity) {
+                    *transform = old;
+                }
+            }
+            set_transform_operator_status(
+                world,
+                OperatorPhase::Canceled,
+                "Transform target disappeared; surviving previews restored",
+            );
             return;
         };
+        let undo_depth = world.resource::<EditorHistory>().undo_depth();
         if group.len() <= 1 {
             set_transform_with_history(world, primary, old_primary, new_primary);
-            return;
+        } else {
-        }
             let changes = transform_group_changes(old_primary, new_primary, group);
             set_transform_group_with_history(world, changes);
         }
+        if world.resource::<EditorHistory>().undo_depth() > undo_depth {
+            set_transform_operator_status(
+                world,
+                OperatorPhase::Committed,
+                "Transform gizmo edit committed",
+            );
+        } else {
+            set_transform_operator_status(
+                world,
+                OperatorPhase::Canceled,
+                "Transform gizmo edit made no changes",
+            );
+        }
+    }
+}
+
+fn set_transform_operator_status(world: &mut World, phase: OperatorPhase, hint: impl Into<String>) {
+    if let Some(mut active) = world.get_resource_mut::<ActiveOperator>() {
+        active.status = Some(OperatorStatus {
+            id: "transform.gizmo".to_string(),
+            label: "Transform Gizmo".to_string(),
+            phase,
+            hint: hint.into(),
+            warnings: Vec::new(),
+        });
+    }
 }
 
 fn transform_group_changes(
@@ -2796,7 +2926,7 @@ pub(crate) fn material_eq(a: &MaterialDesc, b: &MaterialDesc) -> bool {
 mod tests {
     use super::*;
     use crate::operators::test_harness::{assert_undo_redo_round_trip, OperatorInvariantHarness};
-    use crate::operators::{ActiveOperator, OperatorPhase, OperatorStatus};
+    use crate::operators::{ActiveOperator, OperatorPhase};
 
     #[derive(Component, Reflect, Default, Debug, Clone, PartialEq)]
     #[reflect(Component, Default)]
@@ -3074,6 +3204,7 @@ mod tests {
         world.init_resource::<ActiveOperator>();
         world.init_resource::<EditorHistory>();
         world.init_resource::<SceneIo>();
+        world.init_resource::<TransformEditTracker>();
         let first = world.spawn((LevelObject, Transform::default())).id();
         let second = world
             .spawn((
@@ -3085,30 +3216,19 @@ mod tests {
         let committed = vec![Vec3::Z, Vec3::new(2.0, 0.0, 1.0)];
         let harness = OperatorInvariantHarness::capture(&mut world);
 
-        set_transform_group_with_history(
+        world.resource_mut::<TransformEditTracker>().active = Some((
-            &mut world,
-            [
-                (
             first,
             Transform::default(),
-                    Transform::from_translation(committed[0]),
+            vec![
-                ),
+                (first, Transform::default()),
-                (
+                (second, Transform::from_translation(initial[1])),
-                    second,
-                    Transform::from_translation(initial[1]),
-                    Transform::from_translation(committed[1]),
-                ),
             ],
-        );
+        ));
-        world.resource_mut::<ActiveOperator>().status = Some(OperatorStatus {
+        *world.get_mut::<Transform>(first).unwrap() = Transform::from_translation(committed[0]);
-            id: "transform.gizmo".to_string(),
+        capture_gizmo_transform_edits(&mut world);
-            label: "Transform Gizmo".to_string(),
-            phase: OperatorPhase::Committed,
-            hint: "Committed multi-selection drag".to_string(),
-            warnings: Vec::new(),
-        });
 
         harness.assert_committed(&mut world, 1, 0);
+        harness.assert_status(&world, "transform.gizmo", OperatorPhase::Committed);
         assert_undo_redo_round_trip(&mut world, initial, committed, |world| {
             [first, second]
                 .into_iter()
@@ -3117,6 +3237,63 @@ mod tests {
         });
     }
 
+    #[test]
+    fn no_op_transform_release_terminates_preview_without_history() {
+        let mut world = World::new();
+        world.init_resource::<ActiveOperator>();
+        world.init_resource::<EditorHistory>();
+        world.init_resource::<SceneIo>();
+        world.init_resource::<TransformEditTracker>();
+        let transform = Transform::from_xyz(1.0, 2.0, 3.0);
+        let entity = world.spawn((LevelObject, transform)).id();
+        world.resource_mut::<TransformEditTracker>().active =
+            Some((entity, transform, vec![(entity, transform)]));
+        set_transform_operator_status(
+            &mut world,
+            OperatorPhase::Preview,
+            "Transform gizmo drag in progress",
+        );
+        let harness = OperatorInvariantHarness::capture(&mut world);
+
+        capture_gizmo_transform_edits(&mut world);
+
+        harness.assert_canceled(&mut world);
+        harness.assert_status(&world, "transform.gizmo", OperatorPhase::Canceled);
+        assert_eq!(world.get::<Transform>(entity), Some(&transform));
+    }
+
+    #[test]
+    fn missing_primary_transform_rolls_back_surviving_preview_targets() {
+        let mut world = World::new();
+        world.init_resource::<ActiveOperator>();
+        world.init_resource::<EditorHistory>();
+        world.init_resource::<SceneIo>();
+        world.init_resource::<TransformEditTracker>();
+        let primary_old = Transform::from_xyz(1.0, 0.0, 0.0);
+        let survivor_old = Transform::from_xyz(2.0, 0.0, 0.0);
+        let primary = world.spawn((LevelObject, primary_old)).id();
+        let survivor = world.spawn((LevelObject, survivor_old)).id();
+        world.resource_mut::<TransformEditTracker>().active = Some((
+            primary,
+            primary_old,
+            vec![(primary, primary_old), (survivor, survivor_old)],
+        ));
+        *world.get_mut::<Transform>(survivor).unwrap() = Transform::from_xyz(8.0, 0.0, 0.0);
+        world.despawn(primary);
+        set_transform_operator_status(
+            &mut world,
+            OperatorPhase::Preview,
+            "Transform gizmo drag in progress",
+        );
+        let harness = OperatorInvariantHarness::capture(&mut world);
+
+        capture_gizmo_transform_edits(&mut world);
+
+        harness.assert_canceled(&mut world);
+        harness.assert_status(&world, "transform.gizmo", OperatorPhase::Canceled);
+        assert_eq!(world.get::<Transform>(survivor), Some(&survivor_old));
+    }
+
     #[test]
     fn unpack_prefab_is_one_undoable_history_command() {
         let mut world = World::new();

crates/editor/src/operators.rs

@@ -59,6 +59,12 @@ pub enum OperatorAvailability {
     Disabled(String),
 }
 
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum OperatorAction {
+    Commit,
+    ContinuePreview,
+}
+
 pub trait EditorOperator {
     fn id(&self) -> &str;
     fn label(&self) -> &str;
@@ -221,6 +227,51 @@ pub fn run_immediate_operator(
     run_operator(world, &mut operator)
 }
 
+/// Runs an editor command that may either complete immediately or hand ownership to a modal tool.
+/// Modal starters retain the preview status installed by their production entry point.
+pub fn run_operator_action(
+    world: &mut World,
+    id: &str,
+    label: &str,
+    availability: OperatorAvailability,
+    action: impl FnOnce(&mut World) -> Result<OperatorAction, String>,
+) -> bool {
+    if let OperatorAvailability::Disabled(reason) = availability {
+        set_operator_status(
+            world,
+            OperatorStatus::new(id, label, OperatorPhase::Blocked, reason),
+        );
+        return false;
+    }
+
+    set_operator_status(
+        world,
+        OperatorStatus::new(id, label, OperatorPhase::Preview, "Starting"),
+    );
+    match action(world) {
+        Ok(OperatorAction::Commit) => {
+            set_operator_status(
+                world,
+                OperatorStatus::new(
+                    id,
+                    label,
+                    OperatorPhase::Committed,
+                    format!("Completed {label}"),
+                ),
+            );
+            true
+        }
+        Ok(OperatorAction::ContinuePreview) => true,
+        Err(error) => {
+            set_operator_status(
+                world,
+                OperatorStatus::new(id, label, OperatorPhase::Canceled, error),
+            );
+            false
+        }
+    }
+}
+
 fn set_operator_status(world: &mut World, status: OperatorStatus) {
     if let Some(mut active) = world.get_resource_mut::<ActiveOperator>() {
         active.status = Some(status);
@@ -355,6 +406,52 @@ mod tests {
         harness.assert_no_helpers::<PreviewHelper>(&mut world);
     }
 
+    #[test]
+    fn preview_failure_runs_cancel_and_cleans_helpers() {
+        struct PreviewFailure(CounterOperator);
+
+        impl EditorOperator for PreviewFailure {
+            fn id(&self) -> &str {
+                self.0.id()
+            }
+
+            fn label(&self) -> &str {
+                self.0.label()
+            }
+
+            fn begin(&mut self, world: &mut World) -> Result<(), String> {
+                self.0.begin(world)
+            }
+
+            fn preview(&mut self, world: &mut World) -> Result<(), String> {
+                self.0.preview(world)?;
+                Err("preview failed".to_string())
+            }
+
+            fn commit(&mut self, _world: &mut World) -> Result<(), String> {
+                panic!("commit must not run after preview failure")
+            }
+
+            fn cancel(&mut self, world: &mut World) {
+                self.0.cancel(world);
+            }
+        }
+
+        let mut world = test_world();
+        let harness = OperatorInvariantHarness::capture(&mut world);
+        let mut operator = PreviewFailure(CounterOperator {
+            before: 0,
+            helper: None,
+        });
+
+        assert!(!run_operator(&mut world, &mut operator));
+
+        harness.assert_canceled(&mut world);
+        harness.assert_status(&world, "test.counter", OperatorPhase::Canceled);
+        harness.assert_no_helpers::<PreviewHelper>(&mut world);
+        assert_eq!(world.resource::<Counter>().0, 0);
+    }
+
     #[test]
     fn blocked_operator_never_begins_or_mutates_world() {
         let mut world = test_world();

crates/editor/src/operators/test_harness.rs

@@ -47,6 +47,12 @@ impl OperatorInvariantHarness {
                 world.resource::<SceneIo>().dirty,
                 "a committed authored mutation must mark the scene dirty"
             );
+        } else {
+            assert_eq!(
+                world.resource::<SceneIo>().dirty,
+                self.dirty,
+                "a committed non-authoring operator must preserve the prior dirty state"
+            );
         }
         assert_eq!(
             authored_count(world) as isize,
@@ -93,6 +99,39 @@ impl OperatorInvariantHarness {
         );
     }
 
+    pub(crate) fn assert_status(
+        &self,
+        world: &World,
+        expected_id: &str,
+        expected_phase: OperatorPhase,
+    ) {
+        let status = world
+            .resource::<ActiveOperator>()
+            .status
+            .as_ref()
+            .expect("operator must retain an inspectable lifecycle status");
+        assert_eq!(status.id, expected_id, "operator reported the wrong id");
+        assert_eq!(
+            status.phase, expected_phase,
+            "operator reported the wrong phase"
+        );
+    }
+
+    pub(crate) fn assert_projection_unchanged<T>(
+        &self,
+        world: &mut World,
+        expected: T,
+        mut read: impl FnMut(&mut World) -> T,
+    ) where
+        T: Debug + PartialEq,
+    {
+        assert_eq!(
+            read(world),
+            expected,
+            "operator changed authored state without a committed history transaction"
+        );
+    }
+
     fn assert_phase(&self, world: &World, expected: OperatorPhase) {
         let phase = world
             .resource::<ActiveOperator>()

crates/editor/src/ui/helpers.rs

@@ -11,7 +11,10 @@ use sim::Player;
 use crate::assets::{snapshot_for_asset, EditorAsset, EditorAssetKind};
 use crate::camera::EditorCamera;
 use crate::gizmos::{EditorGizmoMode, EditorGizmoSpace};
-use crate::history::{set_material_group_with_history, spawn_with_history, EditorEntitySnapshot};
+use crate::history::{
+    set_light_group_with_history, set_material_group_with_history, spawn_with_history,
+    EditorEntitySnapshot,
+};
 use crate::play::default_player_spawn;
 use crate::scene_io::SceneIo;
 use crate::viewport::{recall_camera_bookmark, save_camera_bookmark, CameraBookmarks};
@@ -191,37 +194,23 @@ pub fn ensure_player_spawn_for_edit(world: &mut World) -> Entity {
 
 /// Removes all authored [`LightDesc`] so project sun/ambient drive outdoor lighting.
 pub fn reset_scene_lighting_to_project_defaults(world: &mut World) {
-    let mut query = world.query_filtered::<Entity, With<LevelObject>>();
+    let mut query = world.query_filtered::<(Entity, &LightDesc), With<LevelObject>>();
-    let with_lights: Vec<Entity> = query
+    let changes = query
         .iter(world)
-        .filter(|entity| world.get::<LightDesc>(*entity).is_some())
+        .map(|(entity, _)| (entity, None))
-        .collect();
+        .collect::<Vec<_>>();
-    for entity in with_lights {
+    set_light_group_with_history(world, changes, "Reset Scene Lighting");
-        if let Ok(mut entity_mut) = world.get_entity_mut(entity) {
-            entity_mut.remove::<LightDesc>();
-        }
-    }
-    world
-        .resource_mut::<crate::scene_io::SceneIo>()
-        .mark_dirty();
 }
 
 /// Removes authored directional lights so [`ProjectSun`] drives outdoor lighting.
 pub fn use_project_sun(world: &mut World) {
     let mut query = world.query_filtered::<(Entity, &LightDesc), With<LevelObject>>();
-    let directionals: Vec<Entity> = query
+    let changes = query
         .iter(world)
         .filter(|(_, light)| matches!(light.kind, AuthoringLightKind::Directional))
-        .map(|(e, _)| e)
+        .map(|(entity, _)| (entity, None))
-        .collect();
+        .collect::<Vec<_>>();
-    for entity in directionals {
+    set_light_group_with_history(world, changes, "Use Project Sun");
-        if let Ok(mut entity_mut) = world.get_entity_mut(entity) {
-            entity_mut.remove::<LightDesc>();
-        }
-    }
-    world
-        .resource_mut::<crate::scene_io::SceneIo>()
-        .mark_dirty();
 }
 
 pub fn create_scene_sun_override_from_project_settings(world: &mut World) -> Entity {

crates/editor/src/viewport/brush_csg.rs

@@ -4,7 +4,7 @@ use bevy::math::Affine3A;
 use bevy::prelude::*;
 use shared::{
     brush_math::{validate_brush, BrushDiagnosticSeverity},
-    BrushDesc, LevelObject,
+    BrushDesc,
 };
 
 use crate::history::apply_brush_csg_with_history;
@@ -64,24 +64,27 @@ pub fn selected_brush_count(world: &World) -> usize {
         .resource::<UiState>()
         .selected_entities
         .iter()
-        .filter(|entity| world.get::<BrushDesc>(*entity).is_some())
+        .filter(|entity| {
+            world.get::<BrushDesc>(*entity).is_some()
+                && crate::ui::selection_ops::is_mutable_level_object(world, *entity)
+        })
         .count()
 }
 
-pub fn intersect_selected_brushes(world: &mut World) {
+pub fn intersect_selected_brushes(world: &mut World) -> Result<(), String> {
-    run_bounds_csg(world, BrushCsgOp::Intersect);
+    run_bounds_csg(world, BrushCsgOp::Intersect)
 }
 
-pub fn merge_selected_brushes(world: &mut World) {
+pub fn merge_selected_brushes(world: &mut World) -> Result<(), String> {
-    run_bounds_csg(world, BrushCsgOp::Merge);
+    run_bounds_csg(world, BrushCsgOp::Merge)
 }
 
-pub fn subtract_selected_brushes(world: &mut World) {
+pub fn subtract_selected_brushes(world: &mut World) -> Result<(), String> {
-    run_bounds_csg(world, BrushCsgOp::Subtract);
+    run_bounds_csg(world, BrushCsgOp::Subtract)
 }
 
 #[derive(Resource, Default, Debug, Clone)]
-struct BrushCsgPreview {
+pub(crate) struct BrushCsgPreview {
     pending: Option<PendingBrushCsg>,
 }
 
@@ -99,18 +102,18 @@ enum BrushCsgOp {
     Subtract,
 }
 
-fn run_bounds_csg(world: &mut World, op: BrushCsgOp) {
+fn run_bounds_csg(world: &mut World, op: BrushCsgOp) -> Result<(), String> {
     let selected: Vec<Entity> = world
         .resource::<UiState>()
         .selected_entities
         .iter()
         .filter(|entity| {
-            world.get::<LevelObject>(*entity).is_some() && world.get::<BrushDesc>(*entity).is_some()
+            world.get::<BrushDesc>(*entity).is_some()
+                && crate::ui::selection_ops::is_mutable_level_object(world, *entity)
         })
         .collect();
     if selected.len() < 2 {
-        set_status(world, "Select at least two brushes for CSG");
+        return csg_failure(world, "Select at least two editable brushes for CSG");
-        return;
     }
     for entity in &selected {
         let Some(brush) = world.get::<BrushDesc>(*entity) else {
@@ -118,20 +121,18 @@ fn run_bounds_csg(world: &mut World, op: BrushCsgOp) {
         };
         let validation = validate_brush(brush);
         if !validation.is_valid() {
-            set_status(
+            return csg_failure(
                 world,
                 format!(
                     "CSG failed: selected brush is invalid: {}",
                     first_brush_error(&validation)
                 ),
             );
-            return;
         }
     }
 
     let Some(primary_bounds) = brush_world_bounds(world, selected[0]) else {
-        set_status(world, "Primary brush has no valid bounds");
+        return csg_failure(world, "Primary brush has no valid bounds");
-        return;
     };
 
     let result = match op {
@@ -147,8 +148,7 @@ fn run_bounds_csg(world: &mut World, op: BrushCsgOp) {
                     continue;
                 };
                 let Some(intersection) = result.intersection(bounds) else {
-                    set_status(world, "Brush intersect failed: no overlap");
+                    return csg_failure(world, "Brush intersect failed: no overlap");
-                    return;
                 };
                 result = intersection;
             }
@@ -156,16 +156,13 @@ fn run_bounds_csg(world: &mut World, op: BrushCsgOp) {
         }
         BrushCsgOp::Subtract => {
             let Some(cutter_bounds) = brush_world_bounds(world, selected[1]) else {
-                set_status(world, "Subtract failed: cutter brush has no valid bounds");
+                return csg_failure(world, "Subtract failed: cutter brush has no valid bounds");
-                return;
             };
             let Some(overlap) = primary_bounds.intersection(cutter_bounds) else {
-                set_status(world, "Subtract failed: brushes do not overlap");
+                return csg_failure(world, "Subtract failed: brushes do not overlap");
-                return;
             };
             let Some(result) = largest_remaining_slab(primary_bounds, overlap) else {
-                set_status(world, "Subtract failed: result would be empty");
+                return csg_failure(world, "Subtract failed: result would be empty");
-                return;
             };
             result
         }
@@ -175,14 +172,13 @@ fn run_bounds_csg(world: &mut World, op: BrushCsgOp) {
     let new_brush = BrushDesc::cuboid(size);
     let validation = validate_brush(&new_brush);
     if !validation.is_valid() {
-        set_status(
+        return csg_failure(
             world,
             format!(
                 "CSG failed: result is invalid: {}",
                 first_brush_error(&validation)
             ),
         );
-        return;
     }
 
     world.resource_mut::<BrushCsgPreview>().pending = Some(PendingBrushCsg {
@@ -197,6 +193,13 @@ fn run_bounds_csg(world: &mut World, op: BrushCsgOp) {
     };
     set_status(world, hint);
     set_csg_operator_status(world, OperatorPhase::Preview, hint);
+    Ok(())
+}
+
+fn csg_failure(world: &mut World, message: impl Into<String>) -> Result<(), String> {
+    let message = message.into();
+    set_status(world, message.clone());
+    Err(message)
 }
 
 fn brush_csg_preview_input(world: &mut World) {
@@ -253,6 +256,22 @@ fn commit_csg_preview(world: &mut World, pending: PendingBrushCsg) {
         );
         return;
     }
+    if pending
+        .selected
+        .iter()
+        .any(|entity| !crate::ui::selection_ops::is_mutable_level_object(world, *entity))
+    {
+        set_status(
+            world,
+            "Brush CSG commit blocked: selected content is no longer editable",
+        );
+        set_csg_operator_status(
+            world,
+            OperatorPhase::Blocked,
+            "Commit blocked: selected content is no longer editable",
+        );
+        return;
+    }
     let new_brush = BrushDesc::cuboid(pending.result.size());
     let to_delete: Vec<_> = if matches!(pending.op, BrushCsgOp::Merge | BrushCsgOp::Intersect) {
         pending
@@ -265,7 +284,11 @@ fn commit_csg_preview(world: &mut World, pending: PendingBrushCsg) {
     } else {
         Vec::new()
     };
-    apply_bounds_result(world, primary, pending.result, new_brush, &to_delete);
+    if !apply_bounds_result(world, primary, pending.result, new_brush, &to_delete) {
+        set_status(world, "Brush CSG commit made no changes");
+        set_csg_operator_status(world, OperatorPhase::Canceled, "No changes");
+        return;
+    }
     let hint = match pending.op {
         BrushCsgOp::Intersect => "Brush intersect committed",
         BrushCsgOp::Merge => "Brush convex merge committed",
@@ -332,14 +355,14 @@ fn apply_bounds_result(
     bounds: BrushBounds,
     new_brush: BrushDesc,
     delete_entities: &[Entity],
-) {
+) -> bool {
     let center = bounds.center();
     let old_transform = world.get::<Transform>(entity).copied().unwrap_or_default();
     let mut new_transform = old_transform;
     new_transform.translation = center;
     new_transform.rotation = Quat::IDENTITY;
     new_transform.scale = Vec3::ONE;
-    apply_brush_csg_with_history(world, entity, new_transform, new_brush, delete_entities);
+    apply_brush_csg_with_history(world, entity, new_transform, new_brush, delete_entities)
 }
 
 fn brush_world_bounds(world: &World, entity: Entity) -> Option<BrushBounds> {
@@ -426,6 +449,7 @@ mod tests {
     use crate::history::{EditorCommand, EditorHistory};
     use crate::operators::test_harness::{assert_undo_redo_round_trip, OperatorInvariantHarness};
     use crate::selection::SelectedEntity;
+    use shared::LevelObject;
 
     fn bounds(min: Vec3, max: Vec3) -> BrushBounds {
         BrushBounds { min, max }

crates/editor/src/viewport/brush_edit.rs

@@ -1308,4 +1308,55 @@ mod tests {
         assert!(state.old_brush.is_none());
         assert!(!state.changed);
     }
+
+    #[test]
+    fn brush_element_release_uses_production_finalizer_and_round_trips() {
+        let mut app = App::new();
+        app.init_resource::<ActiveOperator>()
+            .init_resource::<EditorHistory>()
+            .init_resource::<SceneIo>()
+            .init_resource::<BrushEditMode>()
+            .init_resource::<BrushElementSelection>()
+            .init_resource::<BrushElementGizmoState>()
+            .add_systems(Update, apply_brush_element_gizmo);
+        let original = BrushDesc::cuboid(Vec3::ONE);
+        let preview = BrushDesc::cuboid(Vec3::new(1.5, 1.0, 1.0));
+        let brush_entity = app
+            .world_mut()
+            .spawn((LevelObject, preview.clone(), GlobalTransform::default()))
+            .id();
+        let helper = app
+            .world_mut()
+            .spawn((
+                BrushElementGizmo,
+                Transform::default(),
+                GizmoTarget::default(),
+            ))
+            .id();
+        *app.world_mut().resource_mut::<BrushEditMode>() = BrushEditMode::Vertex;
+        *app.world_mut().resource_mut::<BrushElementSelection>() = BrushElementSelection {
+            brush: Some(brush_entity),
+            elements: vec![BrushElementKey::Vertex {
+                face: original.faces[0].id.clone(),
+                index: 0,
+            }],
+        };
+        *app.world_mut().resource_mut::<BrushElementGizmoState>() = BrushElementGizmoState {
+            entity: Some(helper),
+            brush: Some(brush_entity),
+            old_brush: Some(original.clone()),
+            old_gizmo: Some(Transform::default()),
+            last_gizmo: Some(Transform::from_translation(Vec3::X * 0.25)),
+            changed: true,
+        };
+        let harness = OperatorInvariantHarness::capture(app.world_mut());
+
+        app.update();
+
+        harness.assert_committed(app.world_mut(), 1, 0);
+        harness.assert_status(app.world(), "brush.edit_mode", OperatorPhase::Committed);
+        assert_undo_redo_round_trip(app.world_mut(), original, preview, |world| {
+            world.get::<BrushDesc>(brush_entity).unwrap().clone()
+        });
+    }
 }

crates/editor/src/viewport/material_drop.rs

@@ -779,31 +779,17 @@ fn update_material_drop_session(world: &mut World) {
             .is_some_and(|buttons| buttons.just_pressed(MouseButton::Right));
 
     if cancel_requested && (selection.is_some() || state.preview.is_some()) {
-        restore_material_drop_preview(world, state.preview.take());
+        cancel_material_drop_session(world, &mut state, true);
         clear_drag_and_viewport_click(world);
-        state.feedback = None;
-        state.captures_viewport_input = false;
-        state.cancel_consumed = true;
-        set_drop_operator_status(
-            world,
-            OperatorPhase::Canceled,
-            "Surface assignment canceled",
-        );
         world.insert_resource(state);
         return;
     }
 
     let Some(selection) = selection else {
-        let had_preview = state.preview.is_some();
+        if state.preview.is_some() {
-        restore_material_drop_preview(world, state.preview.take());
+            cancel_material_drop_session(world, &mut state, false);
-        state.feedback = None;
+        } else {
-        state.captures_viewport_input = false;
+            reset_material_drop_session(&mut state, false);
-        if had_preview {
-            set_drop_operator_status(
-                world,
-                OperatorPhase::Canceled,
-                "Surface assignment canceled",
-            );
         }
         world.insert_resource(state);
         return;
@@ -877,19 +863,44 @@ fn update_material_drop_session(world: &mut World) {
     );
 
     if primary_released {
-        let preview = state.preview.take();
+        commit_material_drop_session(world, &mut state);
-        if let Some(preview) = preview.as_ref() {
-            preview.snapshot.restore(world);
-        }
-        if let Some(preview) = preview {
-            commit_material_drop_preview(world, preview);
-        }
         clear_drag_and_viewport_click(world);
-        state.captures_viewport_input = false;
     }
     world.insert_resource(state);
 }
 
+fn cancel_material_drop_session(
+    world: &mut World,
+    state: &mut MaterialDropState,
+    cancel_consumed: bool,
+) {
+    restore_material_drop_preview(world, state.preview.take());
+    reset_material_drop_session(state, cancel_consumed);
+    set_drop_operator_status(
+        world,
+        OperatorPhase::Canceled,
+        "Surface assignment canceled",
+    );
+}
+
+fn commit_material_drop_session(world: &mut World, state: &mut MaterialDropState) -> bool {
+    let Some(preview) = state.preview.take() else {
+        reset_material_drop_session(state, false);
+        return false;
+    };
+    preview.snapshot.restore(world);
+    let committed = commit_material_drop_preview(world, preview);
+    reset_material_drop_session(state, false);
+    committed
+}
+
+fn reset_material_drop_session(state: &mut MaterialDropState, cancel_consumed: bool) {
+    state.resolved = None;
+    state.feedback = None;
+    state.captures_viewport_input = false;
+    state.cancel_consumed = cancel_consumed;
+}
+
 fn restore_material_drop_preview(world: &mut World, preview: Option<MaterialDropPreview>) {
     if let Some(preview) = preview {
         preview.snapshot.restore(world);
@@ -1029,7 +1040,8 @@ fn draw_material_drop_target(
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::history::{apply_command_undo, EditorHistory};
+    use crate::history::EditorHistory;
+    use crate::operators::test_harness::{assert_undo_redo_round_trip, OperatorInvariantHarness};
     use shared::{ActorKind, RendererMaterialSet, RendererMaterialSlot, SharedTypesPlugin};
 
     fn test_app() -> App {
@@ -1098,6 +1110,7 @@ mod tests {
             hit_point: Vec3::ZERO,
             hit_normal: Vec3::Y,
         };
+        let harness = OperatorInvariantHarness::capture(world);
         let preview = begin_material_drop_preview(
             world,
             AssetSelection::File("assets/materials/steel.ron".into()),
@@ -1123,18 +1136,25 @@ mod tests {
         assert!(!world.resource::<SceneIo>().dirty);
         assert_eq!(world.resource::<EditorHistory>().undo_depth(), 0);
 
-        preview.snapshot.restore(world);
+        let mut state = MaterialDropState {
-        assert!(world
+            resolved: Some(target),
-            .get::<StaticMeshRenderer>(entity)
+            preview: Some(preview),
-            .unwrap()
+            feedback: Some(MaterialDropFeedback {
-            .materials
+                valid: true,
-            .slot(&slot_b)
+                action: "Assign material".into(),
-            .unwrap()
+                target: "Crate / B".into(),
-            .material
+            }),
-            .is_none());
+            captures_viewport_input: true,
-        assert!(commit_material_drop_preview(world, preview));
+            cancel_consumed: false,
-        assert_eq!(world.resource::<EditorHistory>().undo_depth(), 1);
+        };
-        assert!(world.resource::<SceneIo>().dirty);
+        assert!(commit_material_drop_session(world, &mut state));
+        harness.assert_committed(world, 1, 0);
+        harness.assert_status(world, "assets.assign_surface", OperatorPhase::Committed);
+        assert!(state.preview.is_none());
+        assert!(state.resolved.is_none());
+        assert!(state.feedback.is_none());
+        assert!(!state.captures_viewport_input);
+        assert!(!state.cancel_consumed);
         assert!(world
             .get::<StaticMeshRenderer>(entity)
             .unwrap()
@@ -1143,16 +1163,17 @@ mod tests {
             .unwrap()
             .material
             .is_none());
-
+        assert_undo_redo_round_trip(world, None, Some("steel".to_string()), |world| {
-        apply_command_undo(world);
+            world
-        assert!(world
                 .get::<StaticMeshRenderer>(entity)
                 .unwrap()
                 .materials
                 .slot(&slot_b)
                 .unwrap()
                 .material
-            .is_none());
+                .as_ref()
+                .map(|material| material.0.asset_id.clone())
+        });
     }
 
     #[test]
@@ -1172,6 +1193,7 @@ mod tests {
             hit_point: Vec3::ZERO,
             hit_normal: Vec3::Y,
         };
+        let harness = OperatorInvariantHarness::capture(world);
         let preview = begin_material_drop_preview(
             world,
             AssetSelection::File("assets/materials/steel.ron".into()),
@@ -1196,9 +1218,26 @@ mod tests {
             .material
             .is_none());
 
-        preview.snapshot.restore(world);
+        let mut state = MaterialDropState {
+            resolved: Some(target),
+            preview: Some(preview),
+            feedback: Some(MaterialDropFeedback {
+                valid: true,
+                action: "Assign material".into(),
+                target: "Blockout / face".into(),
+            }),
+            captures_viewport_input: true,
+            cancel_consumed: false,
+        };
+        cancel_material_drop_session(world, &mut state, true);
+        harness.assert_canceled(world);
+        harness.assert_status(world, "assets.assign_surface", OperatorPhase::Canceled);
         assert_eq!(world.get::<BrushDesc>(entity), Some(&brush));
-        assert!(!world.resource::<SceneIo>().dirty);
+        assert!(state.preview.is_none());
+        assert!(state.resolved.is_none());
+        assert!(state.feedback.is_none());
+        assert!(!state.captures_viewport_input);
+        assert!(state.cancel_consumed);
     }
 
     #[test]

crates/editor/src/viewport/physics_placement.rs

@@ -6,7 +6,7 @@ use std::time::Duration;
 use avian3d::prelude::*;
 use bevy::prelude::*;
 
-use crate::history::set_transform_group_with_history;
+use crate::history::{set_transform_group_with_history, EditorHistory};
 use crate::operators::{ActiveOperator, OperatorPhase, OperatorStatus};
 use crate::state::EditorMode;
 use crate::ui::selection_ops::{entity_name, is_mutable_level_object};
@@ -256,6 +256,7 @@ fn finish_physics_placement(world: &mut World, commit: bool) {
         }
     }
 
+    let undo_depth = world.resource::<EditorHistory>().undo_depth();
     if commit {
         let changes = session.selected.iter().filter_map(|snapshot| {
             final_transforms
@@ -265,6 +266,7 @@ fn finish_physics_placement(world: &mut World, commit: bool) {
         });
         set_transform_group_with_history(world, changes);
     }
+    let committed = commit && world.resource::<EditorHistory>().undo_depth() > undo_depth;
 
     state.phase = PhysicsPlacementPhase::Inactive;
     state.request = PhysicsPlacementRequest::None;
@@ -272,7 +274,14 @@ fn finish_physics_placement(world: &mut World, commit: bool) {
     state.simulated_steps = 0;
     state.last_error = None;
     world.insert_resource(state);
-    clear_operator_status(world);
+    let (phase, hint) = if committed {
+        (OperatorPhase::Committed, "Physics placement committed")
+    } else if commit {
+        (OperatorPhase::Canceled, "Physics placement made no changes")
+    } else {
+        (OperatorPhase::Canceled, "Physics placement canceled")
+    };
+    set_operator_status(world, phase, hint.to_string(), Vec::new());
 }
 
 fn tick_physics_placement(world: &mut World) {
@@ -437,22 +446,12 @@ fn set_operator_status(
     }
 }
 
-fn clear_operator_status(world: &mut World) {
-    if let Some(mut operator) = world.get_resource_mut::<ActiveOperator>() {
-        if operator
-            .status
-            .as_ref()
-            .is_some_and(|status| status.id == "physics.placement")
-        {
-            operator.status = None;
-        }
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::history::{apply_command_undo, EditorHistory};
+    use crate::history::EditorHistory;
+    use crate::operators::test_harness::{assert_undo_redo_round_trip, OperatorInvariantHarness};
+    use crate::scene_io::SceneIo;
     use bevy::asset::{AssetApp, AssetPlugin};
     use bevy::state::app::StatesPlugin;
     use shared::{ColliderDesc, LevelObject, RigidBodyDesc};
@@ -469,7 +468,9 @@ mod tests {
         .init_asset::<Mesh>()
         .init_state::<EditorMode>()
         .init_resource::<PhysicsPlacementState>()
-        .init_resource::<EditorHistory>();
+        .init_resource::<EditorHistory>()
+        .init_resource::<ActiveOperator>()
+        .init_resource::<SceneIo>();
         app.finish();
         app.cleanup();
         app.update();
@@ -498,12 +499,16 @@ mod tests {
             .world_mut()
             .spawn((Name::new("No Physics"), LevelObject, Transform::default()))
             .id();
+        let harness = OperatorInvariantHarness::capture(app.world_mut());
 
         let error = begin_physics_placement(app.world_mut(), [entity]).unwrap_err();
 
         assert!(error.contains("add and enable a Rigid Body"));
         assert!(error.contains("add and enable a non-trigger Collider"));
         assert!(!app.world().resource::<PhysicsPlacementState>().active());
+        harness.assert_blocked(app.world_mut());
+        harness.assert_status(app.world(), "physics.placement", OperatorPhase::Blocked);
+        harness.assert_no_helpers::<PhysicsPlacementPreview>(app.world_mut());
     }
 
     #[test]
@@ -531,6 +536,7 @@ mod tests {
             ))
             .id();
         app.update();
+        let harness = OperatorInvariantHarness::capture(app.world_mut());
 
         begin_physics_placement(app.world_mut(), [selected]).unwrap();
         assert_eq!(
@@ -581,6 +587,9 @@ mod tests {
             Some(&LinearVelocity(Vec3::X * 3.0))
         );
         assert_eq!(app.world().resource::<EditorHistory>().undo_depth(), 0);
+        harness.assert_canceled(app.world_mut());
+        harness.assert_status(app.world(), "physics.placement", OperatorPhase::Canceled);
+        harness.assert_no_helpers::<PhysicsPlacementPreview>(app.world_mut());
     }
 
     #[test]
@@ -594,6 +603,7 @@ mod tests {
         let start = Transform::from_xyz(0.0, 4.0, 0.0);
         let prop = spawn_placeable(app.world_mut(), "Drop Prop", start);
         app.update();
+        let harness = OperatorInvariantHarness::capture(app.world_mut());
 
         begin_physics_placement(app.world_mut(), [prop]).unwrap();
         for _ in 0..400 {
@@ -613,15 +623,75 @@ mod tests {
 
         commit_physics_placement(app.world_mut());
 
-        assert_eq!(app.world().resource::<EditorHistory>().undo_depth(), 1);
+        harness.assert_committed(app.world_mut(), 1, 0);
+        harness.assert_status(app.world(), "physics.placement", OperatorPhase::Committed);
+        harness.assert_no_helpers::<PhysicsPlacementPreview>(app.world_mut());
         assert_eq!(
             app.world().resource::<EditorHistory>().status,
             "Undo: Move Selection"
         );
         assert_eq!(app.world().get::<RigidBody>(prop), Some(&RigidBody::Static));
         assert_eq!(*app.world().get::<Transform>(prop).unwrap(), settled);
+        assert_undo_redo_round_trip(app.world_mut(), start, settled, |world| {
+            *world.get::<Transform>(prop).unwrap()
+        });
+    }
 
-        apply_command_undo(app.world_mut());
+    #[test]
+    fn no_op_commit_terminates_without_dirtying_or_history() {
+        let mut app = app_with_physics();
+        let start = Transform::from_xyz(0.0, 4.0, 0.0);
+        let prop = spawn_placeable(app.world_mut(), "Static Prop", start);
+        app.update();
+        let harness = OperatorInvariantHarness::capture(app.world_mut());
+
+        begin_physics_placement(app.world_mut(), [prop]).unwrap();
+        commit_physics_placement(app.world_mut());
+
+        harness.assert_canceled(app.world_mut());
+        harness.assert_status(app.world(), "physics.placement", OperatorPhase::Canceled);
+        harness.assert_no_helpers::<PhysicsPlacementPreview>(app.world_mut());
         assert_eq!(*app.world().get::<Transform>(prop).unwrap(), start);
+        assert_eq!(app.world().get::<RigidBody>(prop), Some(&RigidBody::Static));
+    }
+
+    #[test]
+    fn multi_select_commit_is_one_transaction_and_cleans_every_preview_helper() {
+        let mut app = app_with_physics();
+        let starts = [
+            Transform::from_xyz(-1.0, 4.0, 0.0),
+            Transform::from_xyz(1.0, 6.0, 0.0),
+        ];
+        let first = spawn_placeable(app.world_mut(), "First", starts[0]);
+        let second = spawn_placeable(app.world_mut(), "Second", starts[1]);
+        app.update();
+        let harness = OperatorInvariantHarness::capture(app.world_mut());
+
+        begin_physics_placement(app.world_mut(), [first, second, first]).unwrap();
+        assert_eq!(
+            app.world()
+                .resource::<PhysicsPlacementState>()
+                .selected_count,
+            2,
+            "duplicate selections must collapse to one placement snapshot"
+        );
+        let committed = [
+            Transform::from_xyz(-1.0, 0.5, 0.0),
+            Transform::from_xyz(1.0, 0.5, 0.0),
+        ];
+        app.world_mut().entity_mut(first).insert(committed[0]);
+        app.world_mut().entity_mut(second).insert(committed[1]);
+
+        commit_physics_placement(app.world_mut());
+
+        harness.assert_committed(app.world_mut(), 1, 0);
+        harness.assert_status(app.world(), "physics.placement", OperatorPhase::Committed);
+        harness.assert_no_helpers::<PhysicsPlacementPreview>(app.world_mut());
+        assert_undo_redo_round_trip(app.world_mut(), starts, committed, |world| {
+            [
+                *world.get::<Transform>(first).unwrap(),
+                *world.get::<Transform>(second).unwrap(),
+            ]
+        });
     }
 }

crates/editor/src/viewport/terrain_paint.rs

@@ -6,7 +6,7 @@ use shared::{TerrainDesc, AUTHORING_COMPONENT_TERRAIN, COMPONENT_TERRAIN_DESC};
 
 use super::terrain_sculpt::{active_scene_ray, smooth_falloff, terrain_ray_hit, TerrainHit};
 use crate::camera::EditorCamera;
-use crate::history::reflected_component_transaction;
+use crate::history::{reflected_component_transaction, EditorHistory};
 use crate::operators::{ActiveOperator, OperatorPhase, OperatorStatus};
 use crate::scene_io::SceneIo;
 use crate::selection::{SelectedEntity, ViewportClick};
@@ -125,16 +125,30 @@ fn terrain_paint_input(
     viewport_click.0 = None;
     state.clamp_settings();
     let Some(entity) = state.target.or(selected.0) else {
-        cancel_stroke(&mut state, &mut terrains);
+        stop_tool_with_rollback(
-        state.stop();
+            &mut state,
+            &mut terrains,
+            &mut scene_io,
+            &mut active_operator,
+            OperatorPhase::Blocked,
+            "Terrain paint stopped: target is unavailable",
+            "Target unavailable",
+        );
         return Ok(());
     };
     if selected.0 != Some(entity) {
         selected.0 = Some(entity);
     }
     if display.clean_game_view {
-        cancel_stroke(&mut state, &mut terrains);
+        stop_tool_with_rollback(
-        state.stop();
+            &mut state,
+            &mut terrains,
+            &mut scene_io,
+            &mut active_operator,
+            OperatorPhase::Canceled,
+            "Terrain paint stopped for clean game view",
+            "Clean game view enabled; weights restored",
+        );
         return Ok(());
     }
     let ctx = contexts.ctx_mut()?;
@@ -142,12 +156,11 @@ fn terrain_paint_input(
         keys.just_pressed(KeyCode::Escape) || buttons.just_pressed(MouseButton::Right);
     if cancel_requested {
         if state.is_stroking() {
-            cancel_stroke(&mut state, &mut terrains);
+            cancel_active_stroke(
-            scene_io.status = "Terrain paint stroke canceled".into();
+                &mut state,
-            set_status(
+                &mut terrains,
+                &mut scene_io,
                 &mut active_operator,
-                OperatorPhase::Canceled,
-                "Weights restored",
             );
         } else {
             state.stop();
@@ -157,14 +170,29 @@ fn terrain_paint_input(
         return Ok(());
     }
     let Ok((global, mut terrain)) = terrains.get_mut(entity) else {
-        state.stroke = None;
+        stop_tool_with_rollback(
-        state.stop();
+            &mut state,
+            &mut terrains,
+            &mut scene_io,
+            &mut active_operator,
+            OperatorPhase::Blocked,
+            "Terrain paint stopped: target no longer exists",
+            "Target no longer exists",
+        );
         return Ok(());
     };
     let layer_count = terrain.material_layers.len();
     if layer_count == 0 {
+        if let Some(stroke) = state.stroke.take() {
+            *terrain = stroke.original;
+        }
         state.stop();
         scene_io.status = "Add a terrain material layer before painting".into();
+        set_status(
+            &mut active_operator,
+            OperatorPhase::Blocked,
+            "Add a material layer before painting",
+        );
         return Ok(());
     }
     state.active_layer = state.active_layer.min(layer_count - 1);
@@ -227,17 +255,8 @@ fn terrain_paint_input(
             let final_terrain = terrain.clone();
             let mode = state.mode;
             commands.queue(move |world: &mut World| {
-                if let Err(error) = commit_paint_stroke(world, stroke, final_terrain) {
+                finish_paint_stroke(world, stroke, final_terrain, mode);
-                    world.resource_mut::<SceneIo>().status =
-                        format!("Terrain paint commit failed: {error}");
-                }
             });
-            scene_io.status = format!("{} terrain material weights committed", mode.label());
-            set_status(
-                &mut active_operator,
-                OperatorPhase::Committed,
-                format!("{} weights; Ctrl+Z to undo", mode.label()),
-            );
         }
     }
     Ok(())
@@ -248,10 +267,11 @@ fn commit_paint_stroke(
     stroke: TerrainPaintStroke,
     final_terrain: TerrainDesc,
 ) -> Result<(), String> {
+    let original = stroke.original;
     if let Ok(mut actor) = world.get_entity_mut(stroke.entity) {
-        actor.insert(stroke.original);
+        actor.insert(original.clone());
     }
-    reflected_component_transaction(
+    let result = reflected_component_transaction(
         world,
         stroke.entity,
         "Paint Terrain Material",
@@ -261,7 +281,77 @@ fn commit_paint_stroke(
             world.entity_mut(entity).insert(final_terrain);
             Ok(())
         },
-    )
+    );
+    if result.is_err() {
+        if let Ok(mut actor) = world.get_entity_mut(stroke.entity) {
+            actor.insert(original);
+        }
+    }
+    result
+}
+
+fn finish_paint_stroke(
+    world: &mut World,
+    stroke: TerrainPaintStroke,
+    final_terrain: TerrainDesc,
+    mode: TerrainPaintMode,
+) {
+    let undo_depth = world.resource::<EditorHistory>().undo_depth();
+    match commit_paint_stroke(world, stroke, final_terrain) {
+        Ok(()) if world.resource::<EditorHistory>().undo_depth() > undo_depth => {
+            world.resource_mut::<SceneIo>().status =
+                format!("{} terrain material weights committed", mode.label());
+            set_status(
+                &mut world.resource_mut::<ActiveOperator>(),
+                OperatorPhase::Committed,
+                format!("{} weights; Ctrl+Z to undo", mode.label()),
+            );
+        }
+        Ok(()) => {
+            world.resource_mut::<SceneIo>().status =
+                format!("{} terrain stroke made no changes", mode.label());
+            set_status(
+                &mut world.resource_mut::<ActiveOperator>(),
+                OperatorPhase::Canceled,
+                format!("{} stroke made no changes", mode.label()),
+            );
+        }
+        Err(error) => {
+            world.resource_mut::<SceneIo>().status =
+                format!("Terrain paint commit failed: {error}");
+            set_status(
+                &mut world.resource_mut::<ActiveOperator>(),
+                OperatorPhase::Blocked,
+                format!("Commit failed: {error}"),
+            );
+        }
+    }
+}
+
+fn cancel_active_stroke(
+    state: &mut TerrainPaintState,
+    terrains: &mut Query<(&GlobalTransform, &mut TerrainDesc)>,
+    scene_io: &mut SceneIo,
+    active_operator: &mut ActiveOperator,
+) {
+    cancel_stroke(state, terrains);
+    scene_io.status = "Terrain paint stroke canceled".into();
+    set_status(active_operator, OperatorPhase::Canceled, "Weights restored");
+}
+
+fn stop_tool_with_rollback(
+    state: &mut TerrainPaintState,
+    terrains: &mut Query<(&GlobalTransform, &mut TerrainDesc)>,
+    scene_io: &mut SceneIo,
+    active_operator: &mut ActiveOperator,
+    phase: OperatorPhase,
+    message: &str,
+    hint: &str,
+) {
+    cancel_stroke(state, terrains);
+    state.stop();
+    scene_io.status = message.to_string();
+    set_status(active_operator, phase, hint);
 }
 
 fn cancel_stroke(
@@ -415,7 +505,8 @@ fn draw_terrain_paint_preview(state: Res<TerrainPaintState>, mut gizmos: Gizmos)
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::history::{apply_command_redo, apply_command_undo, EditorHistory};
+    use crate::history::EditorHistory;
+    use crate::operators::test_harness::{assert_undo_redo_round_trip, OperatorInvariantHarness};
     use shared::{ActorKind, LevelObject};
 
     #[test]
@@ -452,8 +543,10 @@ mod tests {
             .register_type::<shared::TerrainMaterialLayer>()
             .register_type::<shared::EditorAssetRef>();
         let world = app.world_mut();
+        world.init_resource::<ActiveOperator>();
         world.init_resource::<EditorHistory>();
         world.init_resource::<SceneIo>();
+        world.init_resource::<TerrainPaintState>();
         let mut original = TerrainDesc::flat(9);
         original.material_layers = vec![Default::default(), Default::default()];
         let entity = world
@@ -471,23 +564,121 @@ mod tests {
             );
         }
         world.entity_mut(entity).insert(final_terrain.clone());
-        commit_paint_stroke(
+        let stroke = TerrainPaintStroke {
+            entity,
+            original: original.clone(),
+            last_local: Vec3::ZERO,
+        };
+        {
+            let mut state = world.resource_mut::<TerrainPaintState>();
+            state.start(entity, 2);
+            state.stroke = Some(stroke);
+        }
+        let stroke = world
+            .resource_mut::<TerrainPaintState>()
+            .stroke
+            .take()
+            .unwrap();
+        let harness = OperatorInvariantHarness::capture(world);
+
+        finish_paint_stroke(
+            world,
+            stroke,
+            final_terrain.clone(),
+            TerrainPaintMode::Paint,
+        );
+
+        harness.assert_committed(world, 1, 0);
+        harness.assert_status(world, "terrain.paint", OperatorPhase::Committed);
+        assert_eq!(world.get::<TerrainDesc>(entity), Some(&final_terrain));
+        let state = world.resource::<TerrainPaintState>();
+        assert!(state.active);
+        assert_eq!(state.target, Some(entity));
+        assert!(!state.is_stroking());
+        assert_undo_redo_round_trip(world, original, final_terrain, |world| {
+            world.get::<TerrainDesc>(entity).unwrap().clone()
+        });
+    }
+
+    #[test]
+    fn no_op_paint_release_terminates_without_dirtying_or_history() {
+        let mut app = App::new();
+        app.register_type::<ActorKind>()
+            .register_type::<TerrainDesc>()
+            .register_type::<shared::TerrainMaterialLayer>()
+            .register_type::<shared::EditorAssetRef>();
+        let world = app.world_mut();
+        world.init_resource::<ActiveOperator>();
+        world.init_resource::<EditorHistory>();
+        world.init_resource::<SceneIo>();
+        let mut original = TerrainDesc::flat(5);
+        original.material_layers = vec![Default::default(), Default::default()];
+        original.ensure_material_weights();
+        let entity = world
+            .spawn((LevelObject, ActorKind::Terrain, original.clone()))
+            .id();
+        let harness = OperatorInvariantHarness::capture(world);
+
+        finish_paint_stroke(
             world,
             TerrainPaintStroke {
                 entity,
                 original: original.clone(),
                 last_local: Vec3::ZERO,
             },
-            final_terrain.clone(),
+            original.clone(),
-        )
+            TerrainPaintMode::Erase,
-        .unwrap();
+        );
 
-        assert_eq!(world.resource::<EditorHistory>().undo_depth(), 1);
+        harness.assert_canceled(world);
-        assert_eq!(world.get::<TerrainDesc>(entity), Some(&final_terrain));
+        harness.assert_status(world, "terrain.paint", OperatorPhase::Canceled);
-        apply_command_undo(world);
         assert_eq!(world.get::<TerrainDesc>(entity), Some(&original));
-        apply_command_redo(world);
+    }
-        assert_eq!(world.get::<TerrainDesc>(entity), Some(&final_terrain));
+
+    #[test]
+    fn commit_failure_restores_preview_and_reports_blocked_without_history() {
+        let mut app = App::new();
+        let world = app.world_mut();
+        world.init_resource::<ActiveOperator>();
+        world.init_resource::<EditorHistory>();
+        world.init_resource::<SceneIo>();
+        let mut original = TerrainDesc::flat(5);
+        original.material_layers = vec![Default::default(), Default::default()];
+        let mut preview = original.clone();
+        apply_weight_dab(
+            &mut preview,
+            Vec3::ZERO,
+            3.0,
+            0.8,
+            1,
+            TerrainPaintMode::Paint,
+        );
+        let entity = world
+            .spawn((LevelObject, ActorKind::Terrain, preview.clone()))
+            .id();
+        let mut hierarchy = crate::ui::hierarchy_state::HierarchyPanelState::default();
+        hierarchy.locked.insert(entity);
+        world.insert_resource(hierarchy);
+        let harness = OperatorInvariantHarness::capture(world);
+
+        finish_paint_stroke(
+            world,
+            TerrainPaintStroke {
+                entity,
+                original: original.clone(),
+                last_local: Vec3::ZERO,
+            },
+            preview,
+            TerrainPaintMode::Paint,
+        );
+
+        harness.assert_blocked(world);
+        harness.assert_status(world, "terrain.paint", OperatorPhase::Blocked);
+        assert_eq!(world.get::<TerrainDesc>(entity), Some(&original));
+        assert!(world
+            .resource::<SceneIo>()
+            .status
+            .starts_with("Terrain paint commit failed:"));
     }
 
     #[test]
@@ -495,11 +686,21 @@ mod tests {
         fn cancel_once(
             mut state: ResMut<TerrainPaintState>,
             mut terrains: Query<(&GlobalTransform, &mut TerrainDesc)>,
+            mut scene_io: ResMut<SceneIo>,
+            mut active_operator: ResMut<ActiveOperator>,
         ) {
-            cancel_stroke(&mut state, &mut terrains);
+            cancel_active_stroke(
+                &mut state,
+                &mut terrains,
+                &mut scene_io,
+                &mut active_operator,
+            );
         }
 
         let mut app = App::new();
+        app.init_resource::<ActiveOperator>()
+            .init_resource::<EditorHistory>()
+            .init_resource::<SceneIo>();
         let mut original = TerrainDesc::flat(5);
         original.material_layers = vec![Default::default(), Default::default()];
         let mut preview = original.clone();
@@ -513,7 +714,7 @@ mod tests {
         );
         let entity = app
             .world_mut()
-            .spawn((GlobalTransform::default(), preview))
+            .spawn((LevelObject, GlobalTransform::default(), preview))
             .id();
         let mut state = TerrainPaintState::default();
         state.start(entity, 2);
@@ -523,9 +724,72 @@ mod tests {
             last_local: Vec3::ZERO,
         });
         app.insert_resource(state).add_systems(Update, cancel_once);
+        let harness = OperatorInvariantHarness::capture(app.world_mut());
 
         app.update();
+        harness.assert_canceled(app.world_mut());
+        harness.assert_status(app.world(), "terrain.paint", OperatorPhase::Canceled);
         assert_eq!(app.world().get::<TerrainDesc>(entity), Some(&original));
-        assert!(!app.world().resource::<TerrainPaintState>().is_stroking());
+        let state = app.world().resource::<TerrainPaintState>();
+        assert!(state.active);
+        assert_eq!(state.target, Some(entity));
+        assert!(!state.is_stroking());
+    }
+
+    #[test]
+    fn clean_view_interruption_restores_weights_and_terminates_tool() {
+        fn interrupt_once(
+            mut state: ResMut<TerrainPaintState>,
+            mut terrains: Query<(&GlobalTransform, &mut TerrainDesc)>,
+            mut scene_io: ResMut<SceneIo>,
+            mut active_operator: ResMut<ActiveOperator>,
+        ) {
+            stop_tool_with_rollback(
+                &mut state,
+                &mut terrains,
+                &mut scene_io,
+                &mut active_operator,
+                OperatorPhase::Canceled,
+                "Terrain paint stopped for clean game view",
+                "Clean game view enabled; weights restored",
+            );
+        }
+
+        let mut app = App::new();
+        app.init_resource::<ActiveOperator>()
+            .init_resource::<EditorHistory>()
+            .init_resource::<SceneIo>();
+        let mut original = TerrainDesc::flat(5);
+        original.material_layers = vec![Default::default(), Default::default()];
+        let mut preview = original.clone();
+        apply_weight_dab(
+            &mut preview,
+            Vec3::ZERO,
+            3.0,
+            0.8,
+            1,
+            TerrainPaintMode::Paint,
+        );
+        let entity = app
+            .world_mut()
+            .spawn((LevelObject, GlobalTransform::default(), preview))
+            .id();
+        let mut state = TerrainPaintState::default();
+        state.start(entity, 2);
+        state.stroke = Some(TerrainPaintStroke {
+            entity,
+            original: original.clone(),
+            last_local: Vec3::ZERO,
+        });
+        app.insert_resource(state)
+            .add_systems(Update, interrupt_once);
+        let harness = OperatorInvariantHarness::capture(app.world_mut());
+
+        app.update();
+
+        harness.assert_canceled(app.world_mut());
+        harness.assert_status(app.world(), "terrain.paint", OperatorPhase::Canceled);
+        assert_eq!(app.world().get::<TerrainDesc>(entity), Some(&original));
+        assert!(!app.world().resource::<TerrainPaintState>().active);
     }
 }

crates/editor/src/viewport/terrain_sculpt.rs

@@ -5,7 +5,7 @@ use bevy_egui::EguiContexts;
 use shared::{TerrainDesc, AUTHORING_COMPONENT_TERRAIN, COMPONENT_TERRAIN_DESC};
 
 use crate::camera::EditorCamera;
-use crate::history::reflected_component_transaction;
+use crate::history::{reflected_component_transaction, EditorHistory};
 use crate::operators::{ActiveOperator, OperatorPhase, OperatorStatus};
 use crate::scene_io::SceneIo;
 use crate::selection::{SelectedEntity, ViewportClick};
@@ -143,8 +143,15 @@ fn terrain_sculpt_input(
     state.clamp_settings();
 
     let Some(entity) = state.target.or(selected.0) else {
-        cancel_stroke(&mut state, &mut terrains);
+        stop_tool_with_rollback(
-        state.stop();
+            &mut state,
+            &mut terrains,
+            &mut scene_io,
+            &mut active_operator,
+            OperatorPhase::Blocked,
+            "Terrain sculpt stopped: target is unavailable",
+            "Target unavailable",
+        );
         return Ok(());
     };
     if selected.0 != Some(entity) {
@@ -152,8 +159,15 @@ fn terrain_sculpt_input(
     }
 
     if display.clean_game_view {
-        cancel_stroke(&mut state, &mut terrains);
+        stop_tool_with_rollback(
-        state.stop();
+            &mut state,
+            &mut terrains,
+            &mut scene_io,
+            &mut active_operator,
+            OperatorPhase::Canceled,
+            "Terrain sculpt stopped for clean game view",
+            "Clean game view enabled; terrain restored",
+        );
         return Ok(());
     }
 
@@ -163,12 +177,11 @@ fn terrain_sculpt_input(
         keys.just_pressed(KeyCode::Escape) || buttons.just_pressed(MouseButton::Right);
     if cancel_requested {
         if state.is_stroking() {
-            cancel_stroke(&mut state, &mut terrains);
+            cancel_active_stroke(
-            scene_io.status = "Terrain sculpt stroke canceled".to_string();
+                &mut state,
-            set_status(
+                &mut terrains,
+                &mut scene_io,
                 &mut active_operator,
-                OperatorPhase::Canceled,
-                "Stroke canceled; terrain restored",
             );
         } else {
             state.stop();
@@ -179,8 +192,15 @@ fn terrain_sculpt_input(
     }
 
     let Ok((global, mut terrain)) = terrains.get_mut(entity) else {
-        state.stroke = None;
+        stop_tool_with_rollback(
-        state.stop();
+            &mut state,
+            &mut terrains,
+            &mut scene_io,
+            &mut active_operator,
+            OperatorPhase::Blocked,
+            "Terrain sculpt stopped: target no longer exists",
+            "Target no longer exists",
+        );
         return Ok(());
     };
 
@@ -253,18 +273,8 @@ fn terrain_sculpt_input(
             let label = sculpt_history_label(state.mode);
             let mode_label = state.mode.label();
             commands.queue(move |world: &mut World| {
-                let result = commit_terrain_stroke(world, stroke, final_terrain, label);
+                finish_terrain_stroke(world, stroke, final_terrain, label, mode_label);
-                if let Err(error) = result {
-                    world.resource_mut::<SceneIo>().status =
-                        format!("Terrain sculpt commit failed: {error}");
-                }
             });
-            scene_io.status = format!("{mode_label} terrain stroke committed");
-            set_status(
-                &mut active_operator,
-                OperatorPhase::Committed,
-                format!("{mode_label} stroke; Ctrl+Z to undo"),
-            );
         }
     }
     Ok(())
@@ -276,10 +286,11 @@ fn commit_terrain_stroke(
     final_terrain: TerrainDesc,
     label: &'static str,
 ) -> Result<(), String> {
+    let original = stroke.original;
     if let Ok(mut actor) = world.get_entity_mut(stroke.entity) {
-        actor.insert(stroke.original);
+        actor.insert(original.clone());
     }
-    reflected_component_transaction(
+    let result = reflected_component_transaction(
         world,
         stroke.entity,
         label,
@@ -289,7 +300,82 @@ fn commit_terrain_stroke(
             world.entity_mut(entity).insert(final_terrain);
             Ok(())
         },
-    )
+    );
+    if result.is_err() {
+        if let Ok(mut actor) = world.get_entity_mut(stroke.entity) {
+            actor.insert(original);
+        }
+    }
+    result
+}
+
+fn finish_terrain_stroke(
+    world: &mut World,
+    stroke: TerrainStroke,
+    final_terrain: TerrainDesc,
+    label: &'static str,
+    mode_label: &'static str,
+) {
+    let undo_depth = world.resource::<EditorHistory>().undo_depth();
+    match commit_terrain_stroke(world, stroke, final_terrain, label) {
+        Ok(()) if world.resource::<EditorHistory>().undo_depth() > undo_depth => {
+            world.resource_mut::<SceneIo>().status =
+                format!("{mode_label} terrain stroke committed");
+            set_status(
+                &mut world.resource_mut::<ActiveOperator>(),
+                OperatorPhase::Committed,
+                format!("{mode_label} stroke; Ctrl+Z to undo"),
+            );
+        }
+        Ok(()) => {
+            world.resource_mut::<SceneIo>().status =
+                format!("{mode_label} terrain stroke made no changes");
+            set_status(
+                &mut world.resource_mut::<ActiveOperator>(),
+                OperatorPhase::Canceled,
+                format!("{mode_label} stroke made no changes"),
+            );
+        }
+        Err(error) => {
+            world.resource_mut::<SceneIo>().status =
+                format!("Terrain sculpt commit failed: {error}");
+            set_status(
+                &mut world.resource_mut::<ActiveOperator>(),
+                OperatorPhase::Blocked,
+                format!("Commit failed: {error}"),
+            );
+        }
+    }
+}
+
+fn cancel_active_stroke(
+    state: &mut TerrainSculptState,
+    terrains: &mut Query<(&GlobalTransform, &mut TerrainDesc)>,
+    scene_io: &mut SceneIo,
+    active_operator: &mut ActiveOperator,
+) {
+    cancel_stroke(state, terrains);
+    scene_io.status = "Terrain sculpt stroke canceled".to_string();
+    set_status(
+        active_operator,
+        OperatorPhase::Canceled,
+        "Stroke canceled; terrain restored",
+    );
+}
+
+fn stop_tool_with_rollback(
+    state: &mut TerrainSculptState,
+    terrains: &mut Query<(&GlobalTransform, &mut TerrainDesc)>,
+    scene_io: &mut SceneIo,
+    active_operator: &mut ActiveOperator,
+    phase: OperatorPhase,
+    message: &str,
+    hint: &str,
+) {
+    cancel_stroke(state, terrains);
+    state.stop();
+    scene_io.status = message.to_string();
+    set_status(active_operator, phase, hint);
 }
 
 fn cancel_stroke(
@@ -561,7 +647,8 @@ fn draw_terrain_sculpt_preview(state: Res<TerrainSculptState>, mut gizmos: Gizmo
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::history::{apply_command_redo, apply_command_undo, EditorHistory};
+    use crate::history::EditorHistory;
+    use crate::operators::test_harness::{assert_undo_redo_round_trip, OperatorInvariantHarness};
     use shared::{ActorKind, LevelObject};
 
     fn sample(terrain: &TerrainDesc, x: u32, z: u32) -> f32 {
@@ -657,8 +744,10 @@ mod tests {
         app.register_type::<ActorKind>()
             .register_type::<TerrainDesc>();
         let world = app.world_mut();
+        world.init_resource::<ActiveOperator>();
         world.init_resource::<EditorHistory>();
         world.init_resource::<SceneIo>();
+        world.init_resource::<TerrainSculptState>();
         let original = TerrainDesc::flat(9);
         let entity = world
             .spawn((LevelObject, ActorKind::Terrain, original.clone()))
@@ -676,26 +765,126 @@ mod tests {
             );
         }
         world.entity_mut(entity).insert(final_terrain.clone());
-        commit_terrain_stroke(
+        let stroke = TerrainStroke {
+            entity,
+            original: original.clone(),
+            last_local: Vec3::ZERO,
+            flatten_height: 0.0,
+            seed: 7,
+        };
+        {
+            let mut state = world.resource_mut::<TerrainSculptState>();
+            state.start(entity);
+            state.stroke = Some(stroke);
+        }
+        let stroke = world
+            .resource_mut::<TerrainSculptState>()
+            .stroke
+            .take()
+            .unwrap();
+        let harness = OperatorInvariantHarness::capture(world);
+
+        finish_terrain_stroke(
+            world,
+            stroke,
+            final_terrain.clone(),
+            "Raise Terrain",
+            "Raise",
+        );
+
+        harness.assert_committed(world, 1, 0);
+        harness.assert_status(world, "terrain.sculpt", OperatorPhase::Committed);
+        assert_eq!(world.get::<TerrainDesc>(entity), Some(&final_terrain));
+        let state = world.resource::<TerrainSculptState>();
+        assert!(state.active);
+        assert_eq!(state.target, Some(entity));
+        assert!(!state.is_stroking());
+        assert_undo_redo_round_trip(world, original, final_terrain, |world| {
+            world.get::<TerrainDesc>(entity).unwrap().clone()
+        });
+    }
+
+    #[test]
+    fn no_op_stroke_terminates_without_dirtying_or_history() {
+        let mut app = App::new();
+        app.register_type::<ActorKind>()
+            .register_type::<TerrainDesc>();
+        let world = app.world_mut();
+        world.init_resource::<ActiveOperator>();
+        world.init_resource::<EditorHistory>();
+        world.init_resource::<SceneIo>();
+        let original = TerrainDesc::flat(5);
+        let entity = world
+            .spawn((LevelObject, ActorKind::Terrain, original.clone()))
+            .id();
+        let harness = OperatorInvariantHarness::capture(world);
+
+        finish_terrain_stroke(
             world,
             TerrainStroke {
                 entity,
                 original: original.clone(),
                 last_local: Vec3::ZERO,
                 flatten_height: 0.0,
-                seed: 7,
+                seed: 1,
             },
-            final_terrain.clone(),
+            original.clone(),
-            "Raise Terrain",
+            "Smooth Terrain",
-        )
+            "Smooth",
-        .unwrap();
+        );
 
-        assert_eq!(world.resource::<EditorHistory>().undo_depth(), 1);
+        harness.assert_canceled(world);
-        assert_eq!(world.get::<TerrainDesc>(entity), Some(&final_terrain));
+        harness.assert_status(world, "terrain.sculpt", OperatorPhase::Canceled);
-        apply_command_undo(world);
         assert_eq!(world.get::<TerrainDesc>(entity), Some(&original));
-        apply_command_redo(world);
+    }
-        assert_eq!(world.get::<TerrainDesc>(entity), Some(&final_terrain));
+
+    #[test]
+    fn commit_failure_restores_preview_and_reports_blocked_without_history() {
+        let mut app = App::new();
+        let world = app.world_mut();
+        world.init_resource::<ActiveOperator>();
+        world.init_resource::<EditorHistory>();
+        world.init_resource::<SceneIo>();
+        let original = TerrainDesc::flat(5);
+        let mut preview = original.clone();
+        apply_dab(
+            &mut preview,
+            Vec3::ZERO,
+            3.0,
+            0.8,
+            TerrainSculptMode::Raise,
+            0.0,
+            11,
+        );
+        let entity = world
+            .spawn((LevelObject, ActorKind::Terrain, preview.clone()))
+            .id();
+        let mut hierarchy = crate::ui::hierarchy_state::HierarchyPanelState::default();
+        hierarchy.locked.insert(entity);
+        world.insert_resource(hierarchy);
+        let harness = OperatorInvariantHarness::capture(world);
+
+        finish_terrain_stroke(
+            world,
+            TerrainStroke {
+                entity,
+                original: original.clone(),
+                last_local: Vec3::ZERO,
+                flatten_height: 0.0,
+                seed: 11,
+            },
+            preview,
+            "Raise Terrain",
+            "Raise",
+        );
+
+        harness.assert_blocked(world);
+        harness.assert_status(world, "terrain.sculpt", OperatorPhase::Blocked);
+        assert_eq!(world.get::<TerrainDesc>(entity), Some(&original));
+        assert!(world
+            .resource::<SceneIo>()
+            .status
+            .starts_with("Terrain sculpt commit failed:"));
     }
 
     #[test]
@@ -703,11 +892,21 @@ mod tests {
         fn cancel_once(
             mut state: ResMut<TerrainSculptState>,
             mut terrains: Query<(&GlobalTransform, &mut TerrainDesc)>,
+            mut scene_io: ResMut<SceneIo>,
+            mut active_operator: ResMut<ActiveOperator>,
         ) {
-            cancel_stroke(&mut state, &mut terrains);
+            cancel_active_stroke(
+                &mut state,
+                &mut terrains,
+                &mut scene_io,
+                &mut active_operator,
+            );
         }
 
         let mut app = App::new();
+        app.init_resource::<ActiveOperator>()
+            .init_resource::<EditorHistory>()
+            .init_resource::<SceneIo>();
         let original = TerrainDesc::flat(5);
         let mut preview = original.clone();
         apply_dab(
@@ -721,7 +920,7 @@ mod tests {
         );
         let entity = app
             .world_mut()
-            .spawn((GlobalTransform::default(), preview))
+            .spawn((LevelObject, GlobalTransform::default(), preview))
             .id();
         let mut state = TerrainSculptState::default();
         state.start(entity);
@@ -733,9 +932,74 @@ mod tests {
             seed: 11,
         });
         app.insert_resource(state).add_systems(Update, cancel_once);
+        let harness = OperatorInvariantHarness::capture(app.world_mut());
 
         app.update();
+        harness.assert_canceled(app.world_mut());
+        harness.assert_status(app.world(), "terrain.sculpt", OperatorPhase::Canceled);
         assert_eq!(app.world().get::<TerrainDesc>(entity), Some(&original));
-        assert!(!app.world().resource::<TerrainSculptState>().is_stroking());
+        let state = app.world().resource::<TerrainSculptState>();
+        assert!(state.active);
+        assert_eq!(state.target, Some(entity));
+        assert!(!state.is_stroking());
+    }
+
+    #[test]
+    fn clean_view_interruption_restores_stroke_and_terminates_tool() {
+        fn interrupt_once(
+            mut state: ResMut<TerrainSculptState>,
+            mut terrains: Query<(&GlobalTransform, &mut TerrainDesc)>,
+            mut scene_io: ResMut<SceneIo>,
+            mut active_operator: ResMut<ActiveOperator>,
+        ) {
+            stop_tool_with_rollback(
+                &mut state,
+                &mut terrains,
+                &mut scene_io,
+                &mut active_operator,
+                OperatorPhase::Canceled,
+                "Terrain sculpt stopped for clean game view",
+                "Clean game view enabled; terrain restored",
+            );
+        }
+
+        let mut app = App::new();
+        app.init_resource::<ActiveOperator>()
+            .init_resource::<EditorHistory>()
+            .init_resource::<SceneIo>();
+        let original = TerrainDesc::flat(5);
+        let mut preview = original.clone();
+        apply_dab(
+            &mut preview,
+            Vec3::ZERO,
+            3.0,
+            0.8,
+            TerrainSculptMode::Raise,
+            0.0,
+            11,
+        );
+        let entity = app
+            .world_mut()
+            .spawn((LevelObject, GlobalTransform::default(), preview))
+            .id();
+        let mut state = TerrainSculptState::default();
+        state.start(entity);
+        state.stroke = Some(TerrainStroke {
+            entity,
+            original: original.clone(),
+            last_local: Vec3::ZERO,
+            flatten_height: 0.0,
+            seed: 11,
+        });
+        app.insert_resource(state)
+            .add_systems(Update, interrupt_once);
+        let harness = OperatorInvariantHarness::capture(app.world_mut());
+
+        app.update();
+
+        harness.assert_canceled(app.world_mut());
+        harness.assert_status(app.world(), "terrain.sculpt", OperatorPhase::Canceled);
+        assert_eq!(app.world().get::<TerrainDesc>(entity), Some(&original));
+        assert!(!app.world().resource::<TerrainSculptState>().active);
     }
 }

docs/README.md

@@ -91,6 +91,7 @@ Immutable-style log of significant decisions. Add a new numbered ADR when changi
 | [editor/evaluations/physics-placement/](editor/evaluations/physics-placement/) | Live screenshot and acceptance results for physics settling, cancel, commit, undo, and redo |
 | [editor/evaluations/collider-diagnostics/](editor/evaluations/collider-diagnostics/) | Live screenshot and acceptance results for collider overlays, diagnostics, shape history, and placement preflight |
 | [editor/evaluations/navigation-authoring/](editor/evaluations/navigation-authoring/) | Live screenshots and acceptance results for navigation authoring and runtime parity |
+| [editor/evaluations/operator-invariants/](editor/evaluations/operator-invariants/) | Source acceptance results for production operator lifecycle, rollback, cleanup, and undo/redo invariants |
 | [editor/evaluations/production-readiness/](editor/evaluations/production-readiness/) | Current versioned production gate, evidence matrix, candidate commands, soak protocol, and independent sign-off requirements |
 
 ## Working plans (not canonical long-term)
@@ -114,6 +115,7 @@ Detailed milestone and feature plans live in [`.cursor/plans/`](../.cursor/plans
 | `production_readiness_acceptance_*.plan.md` | Release-candidate evidence matrix, blocker sequence, clean-checkout checks, soak, budgets, and independent sign-off |
 | `material_library_and_targeted_drop_*.plan.md` | Dedicated Material Library, exact viewport slot/primitive/brush targeting, hover preview, cancel, and grouped history |
 | `terrain_material_layers_*.plan.md` | Terrain shared-material layers, normalized weights, blended hydration, and modal painting |
+| `operator_invariants_completion_*.plan.md` | Production operator dispatch, interruption, rollback, cleanup, and undo/redo acceptance |
 
 ## Crate responsibilities (quick reference)
 

docs/editor/README.md

@@ -39,6 +39,7 @@ Docs for the in-process egui editor (`crates/editor/`). Update this index when a
 | [evaluations/physics-placement/](evaluations/physics-placement/) | Live screenshot and verification record for multi-prop settling, cancel, commit, undo, and redo |
 | [evaluations/collider-diagnostics/](evaluations/collider-diagnostics/) | Live screenshot and verification record for semantic collider overlays, health linking, shape switching, and placement reuse |
 | [evaluations/navigation-authoring/](evaluations/navigation-authoring/) | Live screenshots and verification record for navigation authoring and runtime parity |
+| [evaluations/operator-invariants/](evaluations/operator-invariants/) | Source acceptance record for production operator lifecycle, rollback, cleanup, and undo/redo invariants |
 | [evaluations/production-readiness/](evaluations/production-readiness/) | Current #50 release-candidate matrix and required clean-checkout, soak, performance, limitation, and independent-signoff evidence |
 
 ## Subsystems (code → doc)

docs/editor/architecture.md

@@ -245,13 +245,16 @@ the Edit-to-Play boundary restore the complete runtime snapshot. See
 
 Structural edits (spawn, delete, transform, rename) go through `EditorHistory` command objects in `history.rs`.
 User-facing actions route through the operator lifecycle in `operators.rs`: begin, preview,
-commit, cancel, disabled reason, and status text. The first bridge wraps command-palette and queued
+commit, cancel, disabled reason, stable ID, and status text. Registered commands return typed
-editor commands as immediate operators, while existing `EditorHistory` commands remain the undo
+`OperatorAction::Commit` or `OperatorAction::ContinuePreview`, so immediate commands finish while
-payload. Asset placement, mesh-subasset placement, texture apply, and material apply actions now
+Draw Brush and CSG retain modal Preview ownership; validation failures terminate instead of leaving
-use immediate operators from `assets::operators`; texture/material changes across a selection use
+stale status. Existing `EditorHistory` commands remain the undo payload. Group Selection is one
-one `SetMaterialGroup` command. Draw Brush, brush CSG, clip, and element gizmo paths publish the
+atomic command that remaps its transient group identity on every redo without reparenting unrelated
-same preview/commit/cancel phases. `operators/test_harness.rs` verifies authored deltas, dirty
+siblings. Lighting reset and Project Sun changes use one grouped light command. Asset placement,
-state, helper cleanup, undo grouping, and undo/redo restoration; see
+assignment, exact material drops, brush tools, terrain strokes, physics placement, and the real
+transform tracker all publish terminal lifecycle state. `operators/test_harness.rs` verifies semantic
+projections, dirty-state preservation, stable IDs, helper cleanup, undo grouping, repeated undo/redo,
+and automatic interruption rollback; see
 [operator-regression-testing.md](operator-regression-testing.md).
 
 PIE stop restores player simulation state only; authored `LevelObject` edits made during PIE remain in the scene.

docs/editor/debt-audit.md

@@ -10,6 +10,7 @@ Living checklist for the production editor program ([ADR 0012](../adr/0012-zero-
 | Monolithic `hydrate_authoring_entities` | Done | `crates/shared/src/hydration/*` modules |
 | Optional / inferred `ActorKind` as long-term save path | Done | Schema v2 + migration; save validates |
 | Hydrated components in committed `.scn.ron` | CI | `scene::validate_scene_authoring_only` + `repo_editor_scene_has_no_hydrated_components` |
+| Production mutation without commit/cancel/failure/undo invariants | Done | Shared operator harness plus typed history projections cover palette, asset, brush, terrain, physics, grouping, lighting, material-drop, and transform paths; see [evaluation](evaluations/operator-invariants/) |
 | Dual FBX thumbnail ad-hoc path (parallel to unified pipeline) | Partial | Phase 5 `assets/thumbnails/` refactor |
 | `failed_keys` thumbnail cache without retry API | Partial | `asset_thumbnails.rs`; Phase 5 `ThumbnailState` |
 
@@ -21,7 +22,7 @@ Living checklist for the production editor program ([ADR 0012](../adr/0012-zero-
 | P1 | `ActorKind` required; `validate_actor` on save |
 | P2 | No runtime components in default inspector |
 | P3 | `HierarchySiblingIndex`; no undefined sibling order |
-| P6 | `ActorInspectorSection` registry; command palette commands; BRP authoring policy |
+| P6 | `ActorInspectorSection` registry; typed immediate/modal command dispatch; BRP authoring policy; production mutation invariants |
 | P7 | ADRs 0009–0012 indexed; CI `shared` + `scene` + `editor` checks |
 
 ## Manual verification (release)
@@ -29,3 +30,4 @@ Living checklist for the production editor program ([ADR 0012](../adr/0012-zero-
 - [ ] R1–R6 rendering/inspector scenarios ([roadmap.md](roadmap.md))
 - [ ] Save/load roundtrip: hierarchy, lights, materials unchanged
 - [ ] PIE 60s stop: project lighting profile unchanged unless scene overrides edited
+- [ ] Rerun the [operator invariant matrix](operator-regression-testing.md) from the nominated release-candidate commit

docs/editor/evaluations/operator-invariants/README.md

@@ -0,0 +1,45 @@
+# Operator Invariants Evaluation
+
+Date: 2026-07-12
+
+Gitea issue:
+[`#33`](https://git.spacetrainclubhouse.com/Falling-Metal-Interactive/Blacksite/issues/33)
+
+This acceptance record covers the source-level production operator contract. It does not nominate a
+release candidate or replace the clean-checkout rerun required by production-readiness gate G3.
+
+## Accepted Coverage
+
+- Registered commands distinguish immediate completion from modal Preview ownership; validation
+  failures terminate with their stable command ID.
+- Group Selection is one history transaction and preserves unrelated hierarchy rows through repeated
+  undo/redo even though the transient group entity is respawned.
+- Reset Lighting and Project Sun changes are grouped, undoable light transactions.
+- Asset/sub-asset placement; material/texture/audio/animation assignment; and exact viewport material
+  drops cover commit, block/failure, cancel where applicable, and semantic undo/redo projections.
+- Draw Brush, CSG, clip, and element-gizmo paths exercise production modal finalizers and helper
+  cleanup.
+- Terrain sculpt/paint cover multi-dab commit, failure rollback, cancel, clean-view interruption, and
+  resource cleanup.
+- Physics placement covers prerequisite block, exact cancel, real settle commit, multi-selection
+  grouping, helper cleanup, undo, and redo.
+- The transform tracker covers continuous multi-target grouping and no-op release termination.
+
+## Verification
+
+The publication worktree passed:
+
+- `cargo test -p editor --lib --no-fail-fast`: 245 passed, 0 failed.
+- `cargo clippy -p editor --lib --tests -- -D warnings`.
+- `cargo fmt --all -- --check`.
+- `cargo test --workspace --all-targets --no-fail-fast`.
+- `cargo clippy --workspace --all-targets -- -D warnings`.
+- `cargo validate-levels --project .`: 62 dependencies, 5 expected non-blocking findings, 0 blocking
+  errors.
+
+The Gitea closure comment records these results with the exact publication commit.
+
+No screenshot is required for this ticket: the accepted surface is lifecycle, rollback, cleanup, and
+history behavior exercised through headless production entry points. Live command/status checks add
+confidence but are not substituted for semantic assertions. Packaged-runtime testing remains
+deferred by project-owner request.

docs/editor/evaluations/production-readiness/README.md

@@ -32,12 +32,12 @@ another commit, a dirty worktree, or an older package do not transfer to the can
 |----|-------------|-------|--------------------------|
 | G1 | Project create/open/resume, scene authoring, autosave/recovery, hierarchy, prefab, and asset integrity pass | Partial | Project/recovery/session/multi-scene/prefab implementations are documented in [project launcher](../../project-launcher.md), [session recovery](../../session-recovery.md), [multi-scene composition](../../multi-scene-composition.md), and [prefab authoring](../../prefab-authoring.md). Collaborative file safety `#49` and non-blocking native dialogs `#52` passed live acceptance. Candidate-specific end-to-end reruns remain. |
 | G2 | Brush, material, terrain, physics placement, animation, audio, navigation, PIE, and build/package samples pass | Fail | Animation, audio, navigation, renderer/material foundation `#51`, Material Library, targeted material drops, terrain `#22`-`#24`, physics placement `#25`, and build foundations are implemented with source/live fixtures. Brush acceptance `#37` remains incomplete. Packaged testing is owner-deferred. |
-| G3 | Undo/redo/cancel invariants and helper cleanup cover every production mutation path | Partial | The reusable harness and current tool coverage are documented in [operator regression testing](../../operator-regression-testing.md). Terrain stroke and physics settle/cancel/undo fixtures now exist; Gitea `#33` remains open for full mutation-path coverage. |
+| G3 | Undo/redo/cancel invariants and helper cleanup cover every production mutation path | Partial | Source implementation and focused evidence are complete in [operator regression testing](../../operator-regression-testing.md) and the [operator-invariants evaluation](../operator-invariants/); Gitea `#33` is ready to close. A clean, exact-candidate rerun is still required for `Pass`. |
 | G4 | Representative project completes an eight-hour soak without unbounded memory/target growth or unrecoverable failure | Missing | No candidate soak log, resource timeline, failure ledger, or target-growth measurement exists. |
 | G5 | Cold start, scene open/save, asset refresh, common manipulation, and package-build budgets are documented and measured | Missing | Gitea `#34` is open; no ratified budgets or candidate measurement record exists. |
 | G6 | Headless content validation and CI are green from a clean checkout | Missing | [CI configuration](../../../../.github/workflows/ci.yml) exists and local source/headless checks have passed during feature work, but no clean-checkout candidate run is linked. The current Gitea server does not expose an Actions run endpoint for this repository. |
 | G7 | First-hour UX and recovery QA are signed off by someone other than the implementer | External | No independent sign-off exists. Gitea `#36` remains open; historical H1-H6 implementation-pass notes do not count. |
-| G8 | Known limitations have severity/workaround and no P0 blocker remains | Fail | Limitations are distributed across feature docs rather than one candidate ledger. Open P0 work includes `#32` and `#33`; `#50` cannot close while a gate-relevant P0 remains. Renderer foundation `#51`, roadmap audit `#35`, Material Library `#16`, targeted drops `#18`, collaborative safety `#49`, and dialog responsiveness `#52` are closed. Property-block application `#53` is P1; dynamic deformed Solari geometry `#54` is a documented P2 limitation with Forward/raster fallback. |
+| G8 | Known limitations have severity/workaround and no P0 blocker remains | Fail | Limitations are distributed across feature docs rather than one candidate ledger. The remaining open P0 implementation blocker is `#32`; `#50` cannot close while it remains. Operator invariants `#33`, renderer foundation `#51`, roadmap audit `#35`, Material Library `#16`, targeted drops `#18`, collaborative safety `#49`, and dialog responsiveness `#52` are complete. Property-block application `#53` is P1; dynamic deformed Solari geometry `#54` is a documented P2 limitation with Forward/raster fallback. |
 
 ## Deliverables
 

docs/editor/operator-regression-testing.md

@@ -11,11 +11,13 @@ Every production operator test must cover the paths it exposes:
 
 | Path | Required proof |
 |------|----------------|
-| Commit | Expected authored entity delta, exact undo-group delta, dirty state, committed phase |
+| Commit | Expected authored projection, exact undo-group delta, dirty state, stable operator ID, committed phase |
-| Cancel or commit failure | No authored entity delta, no new history, prior dirty state, canceled phase |
+| Zero-history commit | Authored projection and prior dirty state remain unchanged |
+| Cancel or commit failure | Exact authored projection restored, no new history, prior dirty state, stable operator ID, terminal canceled/blocked phase |
 | Blocked start | Commit closure never runs; authored state, history, and dirty state are unchanged |
+| Preview failure | Cancel finalizer runs, authored state is restored, and helpers are removed |
 | Preview helpers | No helper component remains after commit or cancel |
-| Undoable commit | `assert_undo_redo_round_trip` restores both initial and committed projections |
+| Undoable commit | `assert_undo_redo_round_trip` restores both initial and committed semantic projections |
 | Continuous edit | The entire interaction creates one history command, not one per frame or target |
 
 The harness intentionally fails with the invariant name in the assertion message. Tests may add
@@ -26,12 +28,12 @@ domain assertions, but should not replace these shared lifecycle checks.
 1. Build a minimal `World` with `ActiveOperator`, `EditorHistory`, and `SceneIo`. Add tool-specific
    selection/resources and `SelectedEntity` when history helpers update selection.
 2. Capture `OperatorInvariantHarness` immediately before starting the operation.
-3. Run the real operator entry point or the same production commit/cancel function used by its
+3. Run the real dispatch path or production finalizer used by the input system. Do not duplicate its
-   input system.
+   state transition in the test.
 4. Call `assert_committed`, `assert_canceled`, or `assert_blocked` with the expected authored and
-   undo deltas.
+   undo deltas, then `assert_status` with the stable operator ID and terminal phase.
 5. For helpers, call `assert_no_helpers::<ToolHelper>`. For undoable work, project the meaningful
-   state through `assert_undo_redo_round_trip`.
+   state through `assert_undo_redo_round_trip`; use `assert_projection_unchanged` for no-op paths.
 
 Do not satisfy a lifecycle test by constructing an `EditorCommand` and checking only its label.
 The test must mutate a world and prove restoration.
@@ -40,15 +42,17 @@ The test must mutate a world and prove restoration.
 
 | Workflow | Coverage |
 |----------|----------|
-| Generic `EditorOperator` | Commit cleanup, commit failure rollback, blocked no-op |
+| Generic `EditorOperator` | Commit cleanup, preview/commit failure rollback, blocked no-op, terminal ID/phase |
-| Asset placement | Commit, dirty state, single undo, authored spawn round trip |
+| Palette and registered commands | Typed immediate commit versus modal preview ownership; failed CSG start terminates |
-| Sub-asset placement | Missing dependency commit failure leaves no side effects |
+| Selection and scene commands | Atomic Group Selection across repeated undo/redo; grouped Reset Lighting and Project Sun history |
-| Texture/material assignment | Multi-actor grouped undo; missing material failure; empty-selection block |
+| Asset workflows | Asset/sub-asset placement; material/texture group assignment; audio/animation assignment and incompatible targets |
-| Draw Brush | Full modal-state cancel; decomposed multi-brush grouped commit and round trip |
+| Viewport material drop | Exact renderer slot/primitive/brush-face preview, cancel, commit, cleanup, undo, and redo |
-| Brush CSG | Pending-preview cancel; merge commit/deletion grouped round trip |
+| Draw Brush and CSG | Modal cancel; decomposed commit; CSG validation/read-only block, cancel, grouped commit, and deleted-brush restoration |
-| Brush clip and element gizmo | Clip grouped geometry round trip; Escape rollback and helper cleanup |
+| Brush clip and element gizmo | Production finalizers, geometry round trip, Escape rollback, and helper cleanup |
-| Transform gizmo finalization | Multi-target continuous edit grouped into one undo command |
+| Terrain sculpt and paint | Multi-dab grouped commit, no-op release, commit failure rollback, cancel, clean-view interruption, and resource cleanup |
+| Physics placement | Prerequisite block, no-op commit, exact cancel, real settle commit, multi-selection grouping, helper cleanup, undo, and redo |
+| Transform gizmo finalization | Actual tracker finalizer, continuous multi-target grouping, no-op release, and missing-primary survivor rollback |
 
-Terrain strokes and physics-settle sessions are roadmap tools, not current production operators.
+The shared harness covers formal operators and multi-frame modal paths. Atomic inspector and history
-Their implementation tickets must add harness fixtures before those tools can pass their own exit
+mutations that do not own `ActiveOperator` use focused typed history tests with equivalent semantic
-gates; Gitea issue BS-JD-502 remains the umbrella until that coverage exists.
+projection and undo/redo assertions.

docs/editor/roadmap.md

@@ -134,6 +134,7 @@ Phased work for the in-process editor (`crates/editor`). Status reflects the cur
 | `ActorInspectorSection` registry | Done | `ext/extensibility.rs` + `game_inspector.rs` |
 | Command registry | Done | Play, lighting reset, group, focus |
 | Command palette (Ctrl+P) | Done | Executes registered commands |
+| Typed operator dispatch and mutation invariants | Done | Immediate commands commit, modal commands retain Preview ownership, and production asset/brush/terrain/physics/history paths pass the shared lifecycle and undo contract ([testing guide](operator-regression-testing.md), [Gitea #33](https://git.spacetrainclubhouse.com/Falling-Metal-Interactive/Blacksite/issues/33)) |
 | `EditorPlugin` trait | Done | `register_editor_plugin`; dogfood panel from `game::editor_ext` |
 | Undo: `SetActorKind`, add/remove component | Done | `SetActorKind` + `AddComponent` / `RemoveComponent` |
 | BRP authoring-only policy | Done | [brp.md](brp.md) |