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).

docs/development/.pi-map.index.md

@@ -0,0 +1,22 @@
+# docs/development (index)
+dir: docs/development
+
+## role
+Developer onboarding and contribution standards documentation for the Headquarter full-stack web application project.
+## parent
+index: docs/.pi-map.index.md
+map: docs/.pi-map.md
+## children
+-
+## files
+- contributing.md
+- quality-gates.md
+- setup.md
+- testing.md
+## links
+index: docs/development/.pi-map.index.md
+map: docs/development/.pi-map.md
+## workflows
+-
+## dirty
+-