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/src/services/instance/.pi-map.index.md

@@ -0,0 +1,23 @@
+# apps/api/src/services/instance (index)
+dir: apps/api/src/services/instance
+
+## role
+Provides infrastructure for managing tool instance lifecycle events, health monitoring, and asynchronous communication within the API service.
+## parent
+index: apps/api/src/services/.pi-map.index.md
+map: apps/api/src/services/.pi-map.md
+## children
+-
+## files
+- __init__.py
+- event_bus.py
+- health_monitor.py
+- lifecycle_hooks.py
+## links
+index: apps/api/src/services/instance/.pi-map.index.md
+map: apps/api/src/services/instance/.pi-map.md
+## workflows
+- change instance behavior
+  read: __init__.py, event_bus.py, health_monitor.py
+## dirty
+-