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/components/features/session/.pi-map.index.md

@@ -0,0 +1,23 @@
+# apps/web/src/components/features/session (index)
+dir: apps/web/src/components/features/session
+
+## role
+Provides UI components for managing development environment sessions including creation, listing, monitoring progress, and interacting with individual sessions.
+## parent
+index: apps/web/src/components/features/.pi-map.index.md
+map: apps/web/src/components/features/.pi-map.md
+## children
+-
+## files
+- create-session-form.tsx
+- session-card.tsx
+- session-list.tsx
+- session-progress-panel.tsx
+## links
+index: apps/web/src/components/features/session/.pi-map.index.md
+map: apps/web/src/components/features/session/.pi-map.md
+## workflows
+- change session behavior
+  read: create-session-form.tsx, session-card.tsx, session-list.tsx
+## dirty
+-