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).

.opencode/skills/openspec-propose/.pi-map.index.md

@@ -0,0 +1,19 @@
+# .opencode/skills/openspec-propose (index)
+dir: .opencode/skills/openspec-propose
+
+## role
+Defines a structured workflow skill for proposing new changes using the openspec CLI, generating proposal, design, and task artifacts in dependency order.
+## parent
+index: .opencode/skills/.pi-map.index.md
+map: .opencode/skills/.pi-map.md
+## children
+-
+## files
+- SKILL.md
+## links
+index: .opencode/skills/openspec-propose/.pi-map.index.md
+map: .opencode/skills/openspec-propose/.pi-map.md
+## workflows
+-
+## dirty
+-

.opencode/skills/openspec-propose/.pi-map.md

@@ -0,0 +1,19 @@
+# .opencode/skills/openspec-propose
+dir: .opencode/skills/openspec-propose
+
+index: .opencode/skills/openspec-propose/.pi-map.index.md
+
+## role
+Defines a structured workflow skill for proposing new changes using the openspec CLI, generating proposal, design, and task artifacts in dependency order.
+## files
+- SKILL.md | Defines a structured workflow for proposing new changes using the openspec CLI, generating proposal, design, and task artifacts in dependency order. | dep: openspec CLI, AskUserQuestion tool, TodoWrite tool
+## arch
+Template-based skill definition using markdown documentation with structured workflow patterns for CLI-driven artifact generation and dependency-ordered execution.
+## tags
+skill, defines, structured, workflow, proposing, new, changes, openspec
+## symbols
+-
+## workflows
+-
+## dirty
+-