chore: track .pi-map.md and .pi-map.index.md artifacts

Remove the map files from .gitignore so they are committed as project
navigation artifacts, and also unignore them in the sample fixture.
Regenerate all maps so the committed versions reflect the current source.

tests/.pi-map.index.md

@@ -0,0 +1,37 @@
+# tests (index)
+dir: tests
+
+## role
+Comprehensive test suite for a project mapping tool that generates AI-readable codebase documentation with LLM integration, caching, and CLI query capabilities.
+## parent
+index: ./.pi-map.index.md
+map: ./.pi-map.md
+## children
+-
+## files
+- ast-extract.test.ts
+- cli.test.ts
+- format.test.ts
+- integration.test.ts
+- llm-batch.test.ts
+- llm-cache.test.ts
+- llm-extract.test.ts
+- llm-integration.test.ts
+- merge.test.ts
+- mock-llm.ts
+- pi-extension.test.ts
+- prompt-injection.test.ts
+- retrieve.test.ts
+- routing-metadata.test.ts
+## links
+index: tests/.pi-map.index.md
+map: tests/.pi-map.md
+## workflows
+- change tests behavior
+  read: mock-llm.ts
+- update tests tests
+  read: ast-extract.test.ts, cli.test.ts, format.test.ts
+- change tests CLI
+  read: cli.test.ts
+## dirty
+-