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/docker-infrastructure/.pi-map.index.md

@@ -0,0 +1,19 @@
+# openspec/specs/docker-infrastructure (index)
+dir: openspec/specs/docker-infrastructure
+
+## role
+Defines Docker-based infrastructure specifications for multi-service development and production deployment environments.
+## parent
+index: openspec/specs/.pi-map.index.md
+map: openspec/specs/.pi-map.md
+## children
+-
+## files
+- spec.md
+## links
+index: openspec/specs/docker-infrastructure/.pi-map.index.md
+map: openspec/specs/docker-infrastructure/.pi-map.md
+## workflows
+-
+## dirty
+-

openspec/specs/docker-infrastructure/.pi-map.md

@@ -0,0 +1,19 @@
+# openspec/specs/docker-infrastructure
+dir: openspec/specs/docker-infrastructure
+
+index: openspec/specs/docker-infrastructure/.pi-map.index.md
+
+## role
+Defines Docker-based infrastructure specifications for multi-service development and production deployment environments.
+## files
+- spec.md | Define Docker-based infrastructure specifications for a multi-service development and production deployment environment | dep: Docker, Docker Compose, Make, Python 3.11, Node.js 20+, nginx, Traefik, Vite, Authentik, Redis, PostgreSQL
+## arch
+Infrastructure-as-code specification using Docker containerization with environment-specific configurations for development and production deployments.
+## tags
+docker, spec, define, infrastructure, specifications, multi, service, development
+## symbols
+-
+## workflows
+-
+## dirty
+-