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/terminal-fullscreen-unified-header/.pi-map.index.md

@@ -0,0 +1,19 @@
+# openspec/changes/terminal-fullscreen-unified-header (index)
+dir: openspec/changes/terminal-fullscreen-unified-header
+
+## role
+Contains a completed specification document for a bugfix that unifies header elements in terminal fullscreen mode.
+## parent
+index: openspec/changes/.pi-map.index.md
+map: openspec/changes/.pi-map.md
+## children
+-
+## files
+- .openspec.yaml
+## links
+index: openspec/changes/terminal-fullscreen-unified-header/.pi-map.index.md
+map: openspec/changes/terminal-fullscreen-unified-header/.pi-map.md
+## workflows
+-
+## dirty
+-

openspec/changes/terminal-fullscreen-unified-header/.pi-map.md

@@ -0,0 +1,19 @@
+# openspec/changes/terminal-fullscreen-unified-header
+dir: openspec/changes/terminal-fullscreen-unified-header
+
+index: openspec/changes/terminal-fullscreen-unified-header/.pi-map.index.md
+
+## role
+Contains a completed specification document for a bugfix that unifies header elements in terminal fullscreen mode.
+## files
+- .openspec.yaml | Defines a completed bugfix specification for unifying terminal fullscreen mode header elements
+## arch
+Specification-driven change management using YAML-based OpenSpec format for tracking bugfixes and UI consistency improvements.
+## tags
+.openspec, defines, completed, bugfix, specification, unifying, terminal, fullscreen
+## symbols
+-
+## workflows
+-
+## dirty
+-