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/unit/.pi-map.index.md

@@ -0,0 +1,47 @@
+# apps/api/tests/unit (index)
+dir: apps/api/tests/unit
+
+## role
+Unit test suite for the API backend, covering configuration, Docker services, git operations, file handling, health monitoring, notifications, permissions, and lifecycle management.
+## parent
+index: apps/api/tests/.pi-map.index.md
+map: apps/api/tests/.pi-map.md
+## children
+-
+## files
+- __init__.py
+- test_config.py
+- test_config_profile_resolver.py
+- test_docker_build.py
+- test_docker_service.py
+- test_event_bus.py
+- test_file_service.py
+- test_git_mount_resolution.py
+- test_git_mounts.py
+- test_git_repository_clone_preflight.py
+- test_git_repository_working_clones.py
+- test_git_service.py
+- test_git_url_parser.py
+- test_health_monitor.py
+- test_home_path_expansion.py
+- test_lifecycle_hooks.py
+- test_manifest_compiler.py
+- test_migration_metadata.py
+- test_monitoring_models.py
+- test_notification_service.py
+- test_notifications_api_routes.py
+- test_permission_fixer.py
+- test_readiness_probe.py
+- test_session_branch_selection.py
+- test_ssh_keys.py
+- test_tool_instances_legacy.py
+## links
+index: apps/api/tests/unit/.pi-map.index.md
+map: apps/api/tests/unit/.pi-map.md
+## workflows
+- change unit behavior
+  read: __init__.py, test_config.py, test_config_profile_resolver.py
+- change unit config
+  read: test_config.py, test_config_profile_resolver.py
+## dirty
+-