Net-new WebSocketRelayTransport.go_dormant() + RelayAdapter.go_dormant() —
the third transport mode the scale-to-zero behaviour layer needs, distinct
from both disconnect() and an unexpected close (decisions.md D12/F14):
- disconnect() sets _closing=True and CANCELS the reconnect supervisor
(terminal "shutting down for good") -> a suspended machine never re-dials
on wake, stranding its buffered backlog.
- an unexpected close re-dials IMMEDIATELY -> the socket never stays down,
so the platform proxy never suspends the machine.
go_dormant(): going_idle->ack (reuse go_idle), then close the socket WITHOUT
setting _closing, so the reader's fall-through still arms the reconnect
supervisor (wake path stays live) but on the longer _dormant_redial_s
cadence so it doesn't fight the platform suspend window. A successful re-dial
clears _dormant. Honors the §3.4 wake->reconnect->drain contract.
Tests: 6 new in test_relay_going_idle.py incl. the F14 regression guard
(routing dormancy through disconnect() fails exactly the 4 wake-path tests).
Full relay suite 140 passed.
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