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/2026-05-19-git-control/specs/.pi-map.index.md

@@ -0,0 +1,19 @@
+# openspec/changes/archive/2026-05-19-git-control/specs (index)
+dir: openspec/changes/archive/2026-05-19-git-control/specs
+
+## role
+Defines REST API and frontend specifications for a Git version control interface supporting branch management, commits, remote sync, and merge operations
+## parent
+index: openspec/changes/archive/2026-05-19-git-control/.pi-map.index.md
+map: openspec/changes/archive/2026-05-19-git-control/.pi-map.md
+## children
+-
+## files
+- spec.md
+## links
+index: openspec/changes/archive/2026-05-19-git-control/specs/.pi-map.index.md
+map: openspec/changes/archive/2026-05-19-git-control/specs/.pi-map.md
+## workflows
+-
+## dirty
+-

openspec/changes/archive/2026-05-19-git-control/specs/.pi-map.md

@@ -0,0 +1,19 @@
+# openspec/changes/archive/2026-05-19-git-control/specs
+dir: openspec/changes/archive/2026-05-19-git-control/specs
+
+index: openspec/changes/archive/2026-05-19-git-control/specs/.pi-map.index.md
+
+## role
+Defines REST API and frontend specifications for a Git version control interface supporting branch management, commits, remote sync, and merge operations
+## files
+- spec.md | Defines a REST API and frontend specification for a Git version control interface enabling branch management, commits, remote sync, and merge operations
+## arch
+API specification document using Markdown-based documentation pattern with RESTful endpoint definitions and frontend UI component specifications
+## tags
+spec, defines, rest, api, frontend, specification, git, version
+## symbols
+-
+## workflows
+-
+## dirty
+-