feat(controller): Integrate py_get_definition for on-demand lookup

src/mcp_client.py

@@ -409,7 +409,7 @@ def py_get_definition(path: str, name: str) -> str:
    start = cast(int, getattr(node, "lineno")) - 1
    end = cast(int, getattr(node, "end_lineno"))
    return "".join(lines[start:end])
-  return f"ERROR: could not find definition '{name}' in {path}"
+  return f"ERROR: definition '{name}' not found in {path}"
  except Exception as e:
   return f"ERROR retrieving definition '{name}' from '{path}': {e}"