A refused rewind now says "unseen later turn" instead of a vague stale-target message.
What's wrong with this entry?
A rewind request can now include the id of the last user message the client actually saw. If turns exist after the rewind point that the client has not seen, the refusal says "unseen later turn" rather than the old catch-all "stale target".
- A prompt that is queued but has not started is now refused separately as "prompt pending".
- The queue check counts the drainable main-thread queue rather than testing a boolean for pending user intent.
- Unconditional in this build.
last_seen_user_message_uuid
Strings lifted out of the shipped bundle, so the claim above can be checked against them.