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).

apps/web/.pi-map.index.md

@@ -0,0 +1,40 @@
+# apps/web (index)
+dir: apps/web
+
+## role
+Browser-based web frontend providing the user-facing React application for code editing, terminal access, and routing functionality.
+## parent
+index: apps/.pi-map.index.md
+map: apps/.pi-map.md
+## children
+- apps/web/.pi-lens
+  index: apps/web/.pi-lens/.pi-map.index.md
+  map: apps/web/.pi-lens/.pi-map.md
+- apps/web/public
+  index: apps/web/public/.pi-map.index.md
+  map: apps/web/public/.pi-map.md
+- apps/web/src
+  index: apps/web/src/.pi-map.index.md
+  map: apps/web/src/.pi-map.md
+## files
+- .env.example
+- .eslintrc.cjs
+- Dockerfile
+- index.html
+- nginx.conf
+- package-lock.json
+- package.json
+- tsconfig.json
+- vite.config.ts
+## links
+index: apps/web/.pi-map.index.md
+map: apps/web/.pi-map.md
+## workflows
+- change web behavior
+  read: .env.example, .eslintrc.cjs, Dockerfile
+- change web config
+  read: package-lock.json, package.json, tsconfig.json
+- explore web subdirectories
+  index: apps/web/.pi-lens/.pi-map.index.md, apps/web/public/.pi-map.index.md, apps/web/src/.pi-map.index.md
+## dirty
+-