feat: titleFrame - send the generated title after stream.done (0.8.0)

[anilguleroglu]

Summary

A chat's copy, feedback and other answer buttons appear only on stream.done. On a conversation's first message, finalizeTurn sent that frame only after the title model answered, so the answer sat finished on screen for a second or more (up to the title timeout) before its buttons showed.

• titleFrame on a streamed message. With "titleFrame": true:
  • stream.done goes out as soon as the answer is stored, without a title.
  • The conversation is given back at that point, so a next message is not refused with conversation_busy, and the rateLimit slot is released.
  • The title is generated afterwards and sent on the same stream as a new stream.title frame ({ conversationId, title }), followed by the session.title event.
  • The stream closes after the title, or right after stream.done when no title is made.
• Without the flag nothing changes: the title stays in stream.done, the JSON answer and the event order are as before.
• ActiveRun.handBack() / sendLate() / afterRelease keep the starting connection open after the run is over. emit is closed by then, so nothing more goes into the run's log.
• New export StreamTitleEvent. Swagger and the streaming / chat-experience guides are updated.
• Version 0.8.0.

chat-ui (next PR) sends the flag when its callbacks take the title.

Test plan

• npx vitest run: 1840 passed (memory, SQLite and Mongo providers; Postgres skipped locally).
• New tests:
  • stream.done comes without a title while the title model is still blocked.
  • The conversation is idle and a second message is answered during that wait.
  • stream.title comes after stream.done, and the title is stored once with one session.title event.
  • Without the flag the title stays in the done frame.
  • With the flag but no title to make, the stream ends at stream.done.
• npm run lint, npm run build
• Local console portal (:3300) running this build.

🤖 Generated with Claude Code

https://claude.ai/code/session_017S1VJk5SuTVqr4dr2at3cH