chore: track all project map and index files

Add generated .pi-map.md and .pi-map.index.md files across the repository
so the project navigation maps are shared and versioned. These artifacts
are maintained by project_map_init/patch/validate and must be kept in
sync with source edits.

Note: .cache/ remains ignored (added in previous commit).

apps/api/tests/integration/.pi-map.index.md

@@ -0,0 +1,37 @@
+# apps/api/tests/integration (index)
+dir: apps/api/tests/integration
+
+## role
+Integration and unit test suite for the API backend, covering authentication, REST endpoints, database models, and core services with real database dependencies.
+## parent
+index: apps/api/tests/.pi-map.index.md
+map: apps/api/tests/.pi-map.md
+## children
+-
+## files
+- __init__.py
+- test_auth_api.py
+- test_auth_services.py
+- test_config_profiles_api.py
+- test_events.py
+- test_git_control.py
+- test_models.py
+- test_notifications_api.py
+- test_notifications_lifecycle.py
+- test_projects_api.py
+- test_seed.py
+- test_ssh_keys_api.py
+- test_tool_types_api.py
+- test_tool_types_api_extended.py
+- test_users_api.py
+- test_workspaces_api.py
+## links
+index: apps/api/tests/integration/.pi-map.index.md
+map: apps/api/tests/integration/.pi-map.md
+## workflows
+- change integration behavior
+  read: __init__.py, test_auth_api.py, test_auth_services.py
+- change integration config
+  read: test_config_profiles_api.py
+## dirty
+-