chore: patch project maps after stale backend test cleanup

Regenerate .pi-map*.md artifacts for source changes in:
- apps/api/src/api/tool/tool_types_validation.py
- apps/api/src/schemas/tool/tool_type.py
- apps/api/tests/integration/test_tool_types_api_extended.py
- and all affected test files from backend-frontend refactoring cleanup

.stoneforge/.pi-map.index.md

@@ -2,7 +2,7 @@
 dir: .stoneforge
 
 ## role
-Hidden system directory storing runtime state, configuration, and version-control metadata for the Stoneforge application.
+Internal configuration and state tracking directory for the Stoneforge application
 ## parent
 index: ./.pi-map.index.md
 map: ./.pi-map.md