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).

openspec/specs/api-documentation/.pi-map.index.md

@@ -0,0 +1,19 @@
+# openspec/specs/api-documentation (index)
+dir: openspec/specs/api-documentation
+
+## role
+Defines OpenAPI specification, health monitoring, and developer onboarding requirements for the FastAPI-based system.
+## parent
+index: openspec/specs/.pi-map.index.md
+map: openspec/specs/.pi-map.md
+## children
+-
+## files
+- spec.md
+## links
+index: openspec/specs/api-documentation/.pi-map.index.md
+map: openspec/specs/api-documentation/.pi-map.md
+## workflows
+-
+## dirty
+-

openspec/specs/api-documentation/.pi-map.md

@@ -0,0 +1,19 @@
+# openspec/specs/api-documentation
+dir: openspec/specs/api-documentation
+
+index: openspec/specs/api-documentation/.pi-map.index.md
+
+## role
+Defines OpenAPI specification, health monitoring, and developer onboarding requirements for the FastAPI-based system.
+## files
+- spec.md | Define API documentation, health monitoring, and developer onboarding requirements for a FastAPI-based system. | dep: FastAPI, Pydantic v2, Swagger UI, Database, Redis
+## arch
+Specification-driven documentation using Markdown-based requirements with FastAPI-native patterns (OpenAPI, health endpoints, auto-generated docs).
+## tags
+fastapi, spec, define, api, documentation, health, monitoring, developer
+## symbols
+-
+## workflows
+-
+## dirty
+-