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).

openspec/specs/session-lifecycle-ux/.pi-map.index.md

@@ -0,0 +1,19 @@
+# openspec/specs/session-lifecycle-ux (index)
+dir: openspec/specs/session-lifecycle-ux
+
+## role
+Defines user experience requirements for session lifecycle management interactions
+## parent
+index: openspec/specs/.pi-map.index.md
+map: openspec/specs/.pi-map.md
+## children
+-
+## files
+- spec.md
+## links
+index: openspec/specs/session-lifecycle-ux/.pi-map.index.md
+map: openspec/specs/session-lifecycle-ux/.pi-map.md
+## workflows
+-
+## dirty
+-

openspec/specs/session-lifecycle-ux/.pi-map.md

@@ -0,0 +1,19 @@
+# openspec/specs/session-lifecycle-ux
+dir: openspec/specs/session-lifecycle-ux
+
+index: openspec/specs/session-lifecycle-ux/.pi-map.index.md
+
+## role
+Defines user experience requirements for session lifecycle management interactions
+## files
+- spec.md | Defines software requirements for session management UI behaviors including stop confirmation dialogs and immediate deletion updates
+## arch
+Specification-driven requirements documentation using behavioral scenario descriptions with explicit user flow states and UI feedback expectations
+## tags
+spec, defines, software, requirements, session, management, behaviors, including
+## symbols
+-
+## workflows
+-
+## dirty
+-