The monitor_for_interrupt() and backup interrupt checks were calling
get_pending_message() which pops the message from the adapter's queue.
This created a race condition: if the agent finished naturally before
checking _interrupt_requested, the pending message was permanently lost.
Timeline of the race:
1. Agent near completion, user sends message
2. Level 1 guard stores message in adapter._pending_messages, sets event
3. monitor_for_interrupt() detects event, POPS message, calls agent.interrupt()
4. Agent's run_conversation() was already returning (interrupted=False)
5. Post-run dequeue finds nothing (monitor already consumed it)
6. result.get('interrupted') is False so interrupt_message fallback doesn't fire
7. User message permanently lost — agent finishes without processing it
Fix: change all three interrupt detection sites (primary monitor + two
backup checks) from get_pending_message() (pop) to
_pending_messages.get() (peek). The message stays in the adapter's queue
until _dequeue_pending_event() consumes it in the post-run handler,
which runs regardless of whether the agent was interrupted or finished
naturally.
Reported by @_SushantSays — intermittent message loss during long
terminal command execution, persisting after the previous fix (73f970fa)
which addressed monitor task death but not this consumption race.
4aa534eae5