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).

docs/guides/.pi-map.md

@@ -0,0 +1,19 @@
+# docs/guides
+dir: docs/guides
+
+index: docs/guides/.pi-map.index.md
+
+## role
+Provides user-facing documentation for advanced configuration features
+## files
+- config-profiles-git-mounts.md | Documents how to mount files and directories from git repositories into tool instances via config profiles | dep: Git, container runtime (bind mounts), glob pattern matching
+## arch
+Simple documentation-as-code with markdown files organized by feature topic
+## tags
+git, config, profiles, mounts, documents, mount, directories, repositories
+## symbols
+-
+## workflows
+-
+## dirty
+-