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/changes/session-list-overhaul/.pi-map.md

@@ -0,0 +1,22 @@
+# openspec/changes/session-list-overhaul
+dir: openspec/changes/session-list-overhaul
+
+index: openspec/changes/session-list-overhaul/.pi-map.index.md
+
+## role
+Frontend refactoring specification for unifying duplicated session list rendering logic across dashboard and sessions pages into reusable components.
+## files
+- .openspec.yaml | Defines an OpenSpec configuration file with schema version and creation date metadata
+- design.md | Design document for refactoring duplicated session list rendering logic into unified reusable components across dashboard and sessions pages. | dep: dashboard.tsx, sessions.tsx, SessionCard, SessionList
+- proposal.md | Proposes a frontend refactoring to unify session list UI components across dashboard and sessions pages | dep: React components, CSS styling, dashboard.tsx, sessions.tsx
+- tasks.md | Task tracking checklist for refactoring session UI components in a web application dashboard
+## arch
+Specification-driven development using OpenSpec schema with design-proposal-task workflow pattern, documenting UI component consolidation through progressive refinement from design docs to implementation checklists.
+## tags
+dashboard, sessions, tsx, design, refactoring, session, components, .openspec
+## symbols
+-
+## workflows
+-
+## dirty
+-