R1: the guarded close send at host.mjs:144 and :150 can still fail with
EPIPE after a broker SIGKILL; reproduced, fix is a send callback.
R2: give-up lands 7.5 min after the first refusal, against decision 72's
reason; Sage's ruling.
Co-Authored-By: Claude Opus 5.5 <[email protected]>