rewind_conversation can reach summarized messages and can refuse when usage-limited

What

rewind_conversation is a request that programs driving Claude Code can send to take a conversation back to an earlier message. It accepts two new options.

• allow_summarized_target lets the rewind aim at a message that has already been folded into a compaction summary. Compaction is when older parts of a long conversation are replaced by a shorter summary. Before, such a target gave target_not_found. Now the rewind resolves to the point just after the summary. When it still cannot find the target, it gives a more specific reason.
• refuse_if_usage_limited checks your usage limit before rewinding. If the limit has been reached, the request is declined with usage_limited.

Why

Rewinding and retrying a turn can now work after a long conversation has been compacted, instead of failing because the original message is gone. Tools that drive Claude Code can also avoid rewinding into a turn that could not run anyway because of a usage limit.