start_session_turn() answers 409 retryable=True while the Agent runtime is
stale, 409 process_wakeup_paused while wake-ups are paused, and 409 with
active_stream_id while the session is busy with another turn. The bridge
released the durable claim as a plain failure each time, so a burst of
refusals within seconds terminally dropped a completion whose origin session
was alive and waiting.
release_async_delegation_delivery(..., retryable=True) now forwards the
refund to an Agent core whose release_event_delivery() accepts the
`retryable` keyword (NousResearch/hermes-agent#120028), detected through
inspect.signature, and falls back to the historical plain release on an
older core. Hard rejections keep the bounded budget.