fix: handle "." path in list_directory for both local and GitHub backends

LLMs naturally call list_dir(".") to list root directory. Previously
sanitize_path rejected "." as invalid. Now ".", "./" and "/" are
treated as root (same as empty string) in list_directory.

Agent-Id: agent-01069cef-6b08-41f1-a15d-29feb2ccaea1

Author: sng-asyncfunc

npx/python/cli/local_repo_tools.py

@@ -101,7 +101,8 @@ async def list_directory(self, path: str = "") -> list[dict[str, Any]]:
         
         Returns structured entries: [{path, type, size}]
         """
-        abs_path = self._resolve_path(path) if path else self.root_path
+        # Treat ".", "./", "/" same as "" (root directory)
+        abs_path = self._resolve_path(path) if path and path.strip() not in (".", "./", "/") else self.root_path
         if abs_path is None:
             return [{"error": "invalid path"}]
 

npx/python/cli/repo_tools.py

@@ -219,7 +219,8 @@ async def list_directory(self, path: str = "") -> list[dict[str, Any]]:
         
         Returns structured entries: [{path, type, size}]
         """
-        clean_path = sanitize_path(path) if path else ""
+        # Treat ".", "./", "/" same as "" (root directory)
+        clean_path = sanitize_path(path) if path and path.strip() not in (".", "./", "/") else ""
         if clean_path is None:
             return [{"error": "invalid path"}]