Follow-up to #80700:
1. _await_disconnect_step was missing the try/except CancelledError around
asyncio.wait() that _await_adapter_cleanup_with_timeout already has.
When the outer fatal-handler timeout cancels disconnect() mid-step,
asyncio.wait does NOT cancel its inner task — the task was orphaned
with no observer. Add the same cancel+detach+re-raise pattern.
2. _queue_retryable_fatal_platform omitted credential_claim/listener_claim
keys that all 3 startup-path queue sites include. These are consumed by
the multiplex reservation logic to prevent secondary profiles from
taking the endpoint while a primary is queued. Pre-existing latent bug
— now fixed since the extraction makes it trivial.
e5e96e8bb5