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/changes/archive/2025-05-18-git-repo-management/.pi-map.index.md

@@ -0,0 +1,24 @@
+# openspec/changes/archive/2025-05-18-git-repo-management (index)
+dir: openspec/changes/archive/2025-05-18-git-repo-management
+
+## role
+Defines a git repository management feature specification for creating, listing, cloning, and deleting bare git repositories within projects.
+## parent
+index: openspec/changes/archive/.pi-map.index.md
+map: openspec/changes/archive/.pi-map.md
+## children
+- openspec/changes/archive/2025-05-18-git-repo-management/specs
+  index: openspec/changes/archive/2025-05-18-git-repo-management/specs/.pi-map.index.md
+  map: openspec/changes/archive/2025-05-18-git-repo-management/specs/.pi-map.md
+## files
+- .openspec.yaml
+- design.md
+- proposal.md
+- tasks.md
+## links
+index: openspec/changes/archive/2025-05-18-git-repo-management/.pi-map.index.md
+map: openspec/changes/archive/2025-05-18-git-repo-management/.pi-map.md
+## workflows
+-
+## dirty
+-