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/services/.pi-map.index.md

@@ -0,0 +1,20 @@
+# apps/api/tests/services (index)
+dir: apps/api/tests/services
+
+## role
+Unit tests for verifying TerminalManager's multi-session terminal lifecycle and resource management capabilities.
+## parent
+index: apps/api/tests/.pi-map.index.md
+map: apps/api/tests/.pi-map.md
+## children
+-
+## files
+- test_terminal_manager_multi.py
+## links
+index: apps/api/tests/services/.pi-map.index.md
+map: apps/api/tests/services/.pi-map.md
+## workflows
+- change services behavior
+  read: test_terminal_manager_multi.py
+## dirty
+-