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.

src/types/.pi-map.md

@@ -0,0 +1,20 @@
+# src/types
+dir: src/types
+
+index: src/types/.pi-map.index.md
+
+## role
+Provides TypeScript type declarations for the Pi AI module's LLM chat completion functionality within the Pi runtime.
+## files
+- pi-ai.d.ts | TypeScript declaration file for the Pi AI module's `complete` function that provides LLM chat completions within the Pi runtime | exp: complete
+## arch
+Minimal declaration-only types package using ambient module declarations (.d.ts) to define external API interfaces without implementation.
+## tags
+complete, pi, ai.d, typescript, declaration, provides, llm, chat
+## symbols
+- complete
+## workflows
+- change types behavior
+  read: pi-ai.d.ts
+## dirty
+-