The popover's read-only info line becomes the explanation under the Hand Off row itself — one button, highlighted as a whole on hover. The wording now states the outcome directly ('Pass this task to another agent in a new tab', plus 'codex will summarize its progress first' when the session is resumable) instead of the jargon 'codex will brief the incoming agent'. The same vocabulary flows through the HUD: 'Only save progress' target row, 'Collect progress summary from codex' stage, 'Saving progress' / 'Progress saved' brief-only states, and the finished subtitle. Docs updated to match.