The original notifyIdle condition (!result.result) never fired in
streaming input mode because every result has non-null text content.
This caused due tasks to wait up to 30 minutes for the idle timer.
- Call notifyIdle for ALL successful results (not just null ones)
- Add isTaskContainer flag so user messages queue instead of being
forwarded to task containers (which blocked notifyIdle from the
message container's onOutput path)
- Reset idleWaiting in sendMessage so containers aren't preempted
while actively working on a new incoming message
- Replace 30-min IDLE_TIMEOUT with 10s close timer for task containers
since they are single-turn and should exit promptly after their result
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>