auto-git:

[add] src/geometry/model-instance-collider-generation.ts
 [add] src/runtime-three/rapier-collision-world.ts
 [change] AGENTS.md
 [change] CHAT_CONTEXT.md
 [change] architecture.md
 [change] package.json
 [change] prompts-lite.txt
 [change] prompts.txt
 [change] roadmap.md
 [change] src/assets/model-instances.ts
 [change] src/document/migrate-scene-document.ts
 [change] src/document/scene-document-validation.ts
 [change] src/document/scene-document.ts
 [change] src/runtime-three/first-person-navigation-controller.ts
 [change] src/runtime-three/navigation-controller.ts
 [change] src/runtime-three/runtime-host.ts
 [change] src/runtime-three/runtime-scene-build.ts
 [change] src/runtime-three/runtime-scene-validation.ts
 [change] src/viewport-three/viewport-host.ts
 [change] testing.md

testing.md

@@ -37,10 +37,11 @@ Highest-priority confidence areas:
 4. per-face material/UV persistence
 5. runtime build correctness
 6. asset import survival
-7. project package portability once binary assets exist
-8. runner navigation/input reliability
-9. spatial audio and interaction basics
-10. critical regressions caught in CI
+7. imported-model collider generation and runtime collision correctness
+8. project package portability once binary assets exist
+9. runner navigation/input reliability
+10. spatial audio and interaction basics
+11. critical regressions caught in CI
 
 ---
 
@@ -158,6 +159,8 @@ Scope:
 - face generation
 - topology expectations
 - collision mesh generation
+- imported-model collider generation
+- Rapier-backed collider/query integration where relevant
 - UV projection generation
 - clipping results
 - derived mesh determinism
@@ -170,6 +173,13 @@ Examples:
 - clipping yields valid child brushes
 - generated geometry contains no NaNs
 - rebuild is deterministic for the same input
+- imported model collider generation produces finite valid data for the selected mode
+- imported-model collider generation honors the authored mode semantics:
+  - terrain -> heightfield
+  - static -> triangle mesh
+  - dynamic -> compound convex pieces
+  - simple -> primitive or convex hull
+- unsupported imported-model collision modes fail clearly instead of producing silent garbage
 
 ### Geometry test principles
 
@@ -212,6 +222,12 @@ For every substantial document feature, add at least:
 - one round-trip save/load test
 - one migration or backward-compatibility consideration if schema changed
 
+For authored imported-model collision settings, also add at least:
+
+- one round-trip test for the selected collision mode/settings
+- one validation/build-path test for missing asset or incompatible collision-mode assumptions where relevant
+- one runtime/query-path test proving the generated collider participates in the actual collision/query layer rather than only existing as dead metadata
+
 ---
 
 ## 5. Browser integration tests