Add: tauri frontend as bevy alternative

docs/RELEASE_TESTING.md

@@ -70,3 +70,31 @@ Before release sign-off for a bug fix:
 - `just qa-validate`
 
 Legacy issues may reference `issues/screenshots/issueN.png` as before evidence.
+
+## Tauri Runtime Behavior Testing
+
+Authoritative workflow: `docs/TAURI_RUNTIME_TESTING.md`.
+
+### Workspace Mode (Required Now)
+
+1. `just build-tauri-ui`
+2. `just check-tauri`
+3. `just check-runtime-core`
+4. `just run-tauri` (smoke and runtime observation)
+5. Verify invoke/event contract behavior:
+- `current_state`
+- `load_active_sprite_pack`
+- `runtime:snapshot`
+6. Verify API/runtime contract behavior against tauri process:
+- `/v1/health`
+- `/v1/state` with auth
+- `/v1/command`
+- `/v1/commands`
+
+### Packaged Mode (Required Once Tauri Packaging Exists)
+
+When tauri packaging automation is available, repeat runtime behavior checks on packaged artifacts:
+
+1. Launch packaged tauri app.
+2. Re-run invoke/event/API checks from workspace mode.
+3. Attach before/after screenshots and command summaries in linked issue.