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/src/.pi-map.index.md

@@ -0,0 +1,50 @@
+# apps/web/src (index)
+dir: apps/web/src
+
+## role
+Frontend web application entry point and core infrastructure for a React-based single-page application with authentication, routing, and domain type definitions.
+## parent
+index: apps/web/.pi-map.index.md
+map: apps/web/.pi-map.md
+## children
+- apps/web/src/api
+  index: apps/web/src/api/.pi-map.index.md
+  map: apps/web/src/api/.pi-map.md
+- apps/web/src/components
+  index: apps/web/src/components/.pi-map.index.md
+  map: apps/web/src/components/.pi-map.md
+- apps/web/src/hooks
+  index: apps/web/src/hooks/.pi-map.index.md
+  map: apps/web/src/hooks/.pi-map.md
+- apps/web/src/pages
+  index: apps/web/src/pages/.pi-map.index.md
+  map: apps/web/src/pages/.pi-map.md
+- apps/web/src/state
+  index: apps/web/src/state/.pi-map.index.md
+  map: apps/web/src/state/.pi-map.md
+- apps/web/src/styles
+  index: apps/web/src/styles/.pi-map.index.md
+  map: apps/web/src/styles/.pi-map.md
+- apps/web/src/test
+  index: apps/web/src/test/.pi-map.index.md
+  map: apps/web/src/test/.pi-map.md
+- apps/web/src/types
+  index: apps/web/src/types/.pi-map.index.md
+  map: apps/web/src/types/.pi-map.md
+- apps/web/src/utils
+  index: apps/web/src/utils/.pi-map.index.md
+  map: apps/web/src/utils/.pi-map.md
+## files
+- main.tsx
+- router.tsx
+- types.ts
+## links
+index: apps/web/src/.pi-map.index.md
+map: apps/web/src/.pi-map.md
+## workflows
+- change src behavior
+  read: main.tsx, router.tsx, types.ts
+- explore src subdirectories
+  index: apps/web/src/api/.pi-map.index.md, apps/web/src/components/.pi-map.index.md, apps/web/src/hooks/.pi-map.index.md
+## dirty
+-