refactor: bound the delivery queue and drop a departed player's backlog

An item takes up to the conversion timeout to drain, far slower than a player
can send, so an unbounded queue grew for as long as a macro ran - each item
holding its sender and recipient alive and arriving minutes after it was typed.
Refusing the overflow is at least visible to the player.

Releasing a player now cancels their worker instead of letting the backlog run.
Finishing it would spend a round trip per item writing to somebody who has left,
and keep both players reachable until it drained.

Chosen over DROP_LATEST on the channel: that reports success to trySend and
drops silently, which would make the warning about discarded work unreachable in
the case it was written for.

Co-Authored-By: Claude <noreply@anthropic.com>

0 files changed, 0 insertions, 0 deletions