This commit refactors the handling of subagent sessions by removing the enrichSubagentMessages function and integrating its functionality into the GET request handler. It also introduces the enrichSubagentSessionFromTranscript function to enhance session data retrieval. Additionally, the persistSubscribeUserMessage function is updated to ensure user messages are saved to the session JSONL file, improving message persistence across page reloads. These changes enhance the clarity and efficiency of subagent session management.