Remote workspace sync should recover after proxy restart #2

Problem

When a remote workspace's proxy restarts, OpenCode can leave workspace sync in error. Adapter failures during target resolution may escape the listener instead of being retried. A repeated sync start during an outage can also reset the listener's retry backoff.

Expected behavior

A registered remote workspace should reconnect on its own when the proxy returns, replay history before becoming connected, and stop retrying when the workspace is removed.

Scope

This tracks the recovery change in this fork only. It does not propose an upstream OpenCode change.