[omartelo]

The Resolve conflicts / Fix CI errors button wrote its prompt through the
screen's ordinary inject, which targets whichever session happens to be
active — the one you were last in, on another branch, with nothing on screen
to say it had happened. With none active it answered Open a session to send this to, which reads as a button that needs another button pressed first.

Now the button does the whole job:

• It works on the pull request's own branch. openInSession answers with the
  session it opened — the live one activated, a parked one resumed, or a worktree
  created from the PR with a session on it — so the handoff reuses that flow
  whole instead of guessing at a target.
• It goes there. The screen the click happened on cannot show what became of
  the prompt, so the click ends in the session that got it. The button says
  Opening session… while a worktree is being made.
• It waits for a prompt to land at. A write issued the moment a session's card
  exists reaches whatever that PTY is up to — the checkout's setup script, a
  provider still taking over the tty — and both read it and discard it, leaving a
  prompt that was never given anything. terminal.Ready is the same question the
  relay asks before delivering a task, and it also answers for a session that has
  not spawned yet, so one call covers every branch above.

Polled from the page rather than waited on in Go: the wait can be minutes on a
first worktree install, and a request held open that long is one of the browser's
handful of connections to this backend. No backend change — terminal.Ready was
already an exported method, so registration already exposed it.

Enter stays the user's. The relay remains the one place lich presses it, for a
sender that is not a person.

Ceilings

The handoff now waits on the same draft gate the relay does, without an Enter of
its own to justify it: hand a conflict to a session you left half a sentence in
and nothing appears at that prompt until the draft goes stale (draftIdle).
Written into the existing bullet in docs/ceilings.md — the alternative, pasting
into the middle of someone's unfinished line, is the worse of the two.

Test plan

• gofmt -l ., go vet ./..., go test ./...
• biome check src, tsc --noEmit, vitest run (1359 tests), vite build
• New unit test: the write does not happen until Ready says so
• By hand: conflicting PR with no checkout → button creates the worktree,
  lands on the new session, prompt appears once the agent is up (not in the
  setup script)
• By hand: same PR with its session already live → activates, navigates,
  prompt is there immediately

https://claude.ai/code/session_01V4L4uMYd3WoQWRraqo9FPa