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).

.opencode/commands/.pi-map.index.md

@@ -0,0 +1,22 @@
+# .opencode/commands (index)
+dir: .opencode/commands
+
+## role
+Defines structured workflow commands and AI assistant stances for an experimental OpenSpec-based development system that guides changes through exploration, proposal, implementation, and archival phases.
+## parent
+index: .opencode/.pi-map.index.md
+map: .opencode/.pi-map.md
+## children
+-
+## files
+- opsx-apply.md
+- opsx-archive.md
+- opsx-explore.md
+- opsx-propose.md
+## links
+index: .opencode/commands/.pi-map.index.md
+map: .opencode/commands/.pi-map.md
+## workflows
+-
+## dirty
+-