Remote Control: session shows "environment was deleted" after server exit; no way to re-attach to a new environment

Summary

After a claude remote-control (server mode) process exits following a network outage, sessions it was serving show "This session's environment was deleted — Start a new session to keep working." in claude.ai/code / the desktop app. The conversation is still visible, but the session can't be continued, and there is no way to resurrect it into a new environment even though the full transcript still exists locally.

Steps to reproduce

1. Run claude remote-control (server mode) as a systemd user service with several sessions (7/32 in my case).
2. Lose network (wifi beacon loss) for >10 min. Per the docs, server mode gives up after ~10 min and the process exits (it exited with code 0).
3. Restart the service ~7 hours later (claude remote-control, same directory).
4. Open the old sessions in claude.ai/code or the desktop app.

Actual

• Old sessions are listed but show "This session's environment was deleted. Start a new session to keep working." with no way to continue.
• The restarted server registers a new environment and serves only a fresh session; the old sessions are not attached to it.

Expected

• If the session is merely archived/disconnected (its history is still stored server-side and the transcript still exists locally), I should be able to re-attach it to a new environment, e.g. via an explicit "Resume in new environment" action, or claude remote-control --session-id <id> binding the session to the current environment.
• At minimum, the UI should say why the environment was deleted and what the recovery options are.

Notes

• The local transcripts under ~/.claude/projects/<project>/*.jsonl are intact, so claude --resume works locally, but the claude.ai-side session cannot be re-linked.
• Exit code 0 on giving up after the outage makes Restart=on-failure in systemd not restart the service (I worked around this in a wrapper script). Server mode exiting non-zero when it gives up would help; a related but separate point.
• Related: #93345.

Version: Claude Code 2.1.296, Linux (Ubuntu), systemd user unit.