Add AST extraction tests, broader ignore patterns, build dist

- ast-extract.ts: Support tree-sitter-python and tree-sitter-go grammar
  loading (pkg.language fallback)
- discover.ts: Add cache directories to default ignore (.cache, tmp,
  temp, .turbo, .parcel-cache, .eslintcache, .prettiercache)
- tests: Add TypeScript AST extraction tests (exports + imports)
- Verified on real project: media_library_viewer (196 .pi-map.md files)
  with accurate React component extraction
- Build: npm run build produces clean dist/ output

All 16 tests pass.

src/ast-extract.ts

@@ -40,7 +40,8 @@ export async function extractFileAST(
 			// For other languages, try to require the grammar package
 			try {
 				const pkg = require(`tree-sitter-${langName}`);
-				grammar = pkg.default || pkg;
+				// Some packages export { language }, others export the grammar directly
+				grammar = pkg.language || pkg.default || pkg;
 			} catch {
 				return null;
 			}

src/discover.ts

@@ -14,6 +14,14 @@ const DEFAULT_IGNORE = [
 	".DS_Store",
 	"*.log",
 	".pi-map.md",
+	".cache",
+	"tmp",
+	"temp",
+	".tmp",
+	".turbo",
+	".parcel-cache",
+	".eslintcache",
+	".prettiercache",
 ];
 
 export interface DirectoryEntry {