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/home-path-expansion/.pi-map.index.md

@@ -0,0 +1,19 @@
+# openspec/changes/home-path-expansion (index)
+dir: openspec/changes/home-path-expansion
+
+## role
+Defines a completed feature specification for resolving home directory path expansion (~ and $HOME) in container mount target paths based on manifest user configuration.
+## parent
+index: openspec/changes/.pi-map.index.md
+map: openspec/changes/.pi-map.md
+## children
+-
+## files
+- .openspec.yaml
+## links
+index: openspec/changes/home-path-expansion/.pi-map.index.md
+map: openspec/changes/home-path-expansion/.pi-map.md
+## workflows
+-
+## dirty
+-

openspec/changes/home-path-expansion/.pi-map.md

@@ -0,0 +1,19 @@
+# openspec/changes/home-path-expansion
+dir: openspec/changes/home-path-expansion
+
+index: openspec/changes/home-path-expansion/.pi-map.index.md
+
+## role
+Defines a completed feature specification for resolving home directory path expansion (~ and $HOME) in container mount target paths based on manifest user configuration.
+## files
+- .openspec.yaml | Defines a completed feature specification for resolving home directory path expansion (~ and $HOME) in container mount target paths based on manifest user configuration.
+## arch
+Specification-driven design using YAML-based OpenSpec format with feature completion tracking, documenting requirements for shell-style variable expansion integrated with container manifest user configuration.
+## tags
+home, .openspec, defines, completed, feature, specification, resolving, directory
+## symbols
+-
+## workflows
+-
+## dirty
+-