1.8.3

Fixed

• A teammate following a turn whose writer died is told it is over. A
  turn's writer now renews a short-lived key while it runs, and a follower
  that hears nothing for a few seconds checks it: once it has expired, as it
  does when the API process writing the turn is killed, the follow ends and
  the chat re-reads the transcript, instead of waiting until a reload. The
  turn is also forgotten, so the next person to open the chat is not sent to
  follow it.
• Redis trouble no longer stalls a chat or floods the log. Every call the
  live chat makes to Redis gives up after two seconds, and each kind of
  failure is logged at most once a minute with a count of the ones left out,
  rather than once per open socket per retry.
• A live turn's replay has a total size. Past 16 MB a turn's frames are
  still sent to whoever is following, and only the start and the end are kept
  for somebody arriving later. Frames published at once by a turn and its
  delegates keep their order in the replay.
• Leaving a chat, or stopping following a turn, finishes before anything
  else starts. The tasks behind them are now awaited, so a heartbeat can no
  longer count a socket back into a room it has just left. A turn that ends
  while its socket is closing is still announced to the person who left.
• Parallel delegations to one remote A2A agent no longer share a
  conversation. Each delegation keeps its own contextId, so two tasks sent
  at once no longer race on one, and a follow-up continues the right one.
• A2A takes text and says so. The server refuses a message with a data or
  file part with -32005 (content type not supported) rather than a generic
  error, and refuses a key that may not run the agent with HTTP 403 (or 404)
  instead of the -32600 that means a malformed request. A task id this
  server never issued is an unknown task (-32001). The client shows a data
  or file part in an answer as a line naming it rather than dropping it.
• Registering two remote agents under one name at once is refused as a
  taken handle, not an error.
• The project picker asks for projects only when it opens, and the typing
  indicator is a live region screen readers announce (#2210).