Follow-up to #106316. send_final_ledgered resolved the live adapter internally and
_send_final_text resolved it a second time for _schedule_ephemeral_delete; a reconnect between
the two sent the delete to a transport that never owned result.message_id (the ownership rule
_final_delivery_adapter documents). The bracket now returns (result, adapter).
The queued lane carried the ledger identity through MessageEvent.message_id while the PR added
ledger_message_id for exactly that; it now uses the typed field, and the ledger read is
getattr-tolerant of duck-typed events (a missing attribute was swallowed as "ledger skipped").
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