This matrix records the current authored labs and executable galleries. A scene can be valuable representative content without requiring a dedicated application.

Surface	Classification and scene	Capability pressure	Current automated proof	Packaging status
Level Slice	Authored lab: @shared/scenes/level_slice.scene.yaml	Navigation, interaction puzzle, inventory, checkpoint, exit transition, mission, and progression behavior	Four session_level_slice_* scenario targets; level/runtime-host coverage; editor_standalone_level_slice_runner_tests	Workspace content only; no application or lab bundle
World Sandbox	Authored reference lab: @shared/scenes/world_sandbox.scene.yaml	Environment, lighting, materials, scale, sightlines, scene composition, and active-pawn traversal	session_active_pawn_core_tests; graphics_asset_contract_tests; editor_standalone_world_sandbox_runner_tests	Workspace content only; no application or lab bundle
Behavior Lab	Authored lab: @shared/scenes/behavior_lab_patrol.scene.yaml	Behavior graphs, patrol progression, perception, investigation/chase/return, actor-control integration, and authoring pressure	session_patrol_progression_tests; actor-control and shared-combat sample coverage; editor_standalone_behavior_lab_runner_tests	Workspace content only; no application or lab bundle
Combat Lab	Authored lab: @shared/scenes/combat_lab.scene.yaml	Active pawn, NPC actor control, perception, ranged/melee combat, defeat/respawn, encounter, and presentation pressure	session_ai_combat_lab_sample_tests; related combat suites; editor_standalone_combat_lab_runner_tests	Workspace content only; no application or lab bundle
Material Gallery	Provisional executable example: @shared/scenes/material_gallery.scene.yaml	Mesh-only composition plus material, lighting, alpha, PBR, and import validation	Gallery binary build smoke; separate glTF material-gallery import/validation coverage. No application runtime test	Buildable with full shared runfiles; no gallery bundle
Physics Gallery	Provisional executable example: @shared/scenes/physics_gallery.scene.yaml	Mesh-only composition plus rigid bodies, colliders, hierarchy, stability, and audio	Gallery binary build smoke; physics_stability_gallery_tests loads the authored scene directly	Buildable with full shared runfiles; no gallery bundle
Sprite Gallery	Retained executable example: @shared/scenes/sprite_gallery.scene.yaml	Intentional SpriteOnly composition plus sprite alpha, wrap, offset, visibility, prefab, camera, and audio	Gallery binary build smoke. No application runtime test is added by this slice	Buildable with full shared runfiles; no gallery bundle

Reading the Matrix

Build smoke proves that a gallery remains buildable; it does not prove its interactive teaching behavior. Direct scene tests prove only the capabilities they exercise. The GPU-tagged standalone lab tests prove generic-runner startup and control against the authored scenes, while the focused scene-play suites carry deterministic behavior assertions.

The four labs deliberately have no dedicated application wrapper. Material and Physics Gallery remain provisional executables pending a later decision. Sprite Gallery remains executable because its source-level SpriteOnly profile choice would be lost in generic hybrid scene execution.