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/mobile-repo-workspace/.pi-map.md

@@ -0,0 +1,19 @@
+# openspec/specs/mobile-repo-workspace
+dir: openspec/specs/mobile-repo-workspace
+
+index: openspec/specs/mobile-repo-workspace/.pi-map.index.md
+
+## role
+Defines functional requirements and user interaction specifications for the mobile repository workspace interface.
+## files
+- spec.md | Define mobile UI requirements for a repository workspace featuring file tree navigation, editor, git, and terminal views
+## arch
+Specification-driven design using modular view decomposition (file tree, editor, git, terminal) with responsive mobile UX patterns.
+## tags
+spec, define, mobile, requirements, repository, workspace, featuring, tree
+## symbols
+-
+## workflows
+-
+## dirty
+-