Repeated /queue commands now each produce a full agent turn, in order,
with no merging. Previously the second /queue overwrote the first
because the handler wrote directly into the adapter's single-slot
_pending_messages dict.
- GatewayRunner grows a _queued_events overflow buffer (dict of list).
- /queue puts new items in the adapter's next-up slot when free,
otherwise appends to the overflow. After each run's drain consumes
the slot, the next overflow item is promoted so the recursive run
picks it up.
- /new and /reset clear the overflow.
- /status now reports queue depth when non-zero.
- Ack message shows the depth once it exceeds 1.
Helpers (_enqueue_fifo, _promote_queued_event, _queue_depth) use the
getattr default-fallback pattern so existing tests that build bare
GatewayRunner instances via object.__new__ keep working.
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