#85796 (live-cards gateway half) landed on main and touches the same
two files. Resolutions:
- adapter.py __init__: union — the dedupe seen-set and the live-cards
draft/seal caches are independent sibling attributes.
- ws_transport.py _request_response: keep main's ambiguous-timeout
contract AND this branch's raising-write catch, composed: a raise
from the WRITE itself means the frame never reached the wire
(definite non-delivery, no flag), while a failure surfaced after the
frame was sent carries ambiguous=True like the timeout — tracked via
a frame_sent marker.
Ben Barclay
141af4febf