feat(triage): push signal sweeps to phone via agent-text in auto mode

Auto mode is the away-from-desk mode. A sweep worth seeing should reach Craig's phone, not just print into a session he isn't watching. I folded a Phone delivery subsection into canonical triage-intake.org: a full-three-section sweep now pushes to the phone over Signal via agent-text. A pointer from End-of-sweep output and a Living Document note tie it in.

Signal-only, by Craig's ruling: a quiet sweep's "nothing" heartbeat never reaches the phone. Silent-until-signal governs the phone channel too, so it only fires on real signal. The in-session heartbeat stays as proof the loop ran.

Only the send half ships. Reply polling (the retired ntfy design's phone-recv) waits on the reply-correlation follow-up: a Signal reply fans out to every linked device and neither knows which page it answers. That spec owns the recv wiring. I re-pointed the transport off dead ntfy onto agent-text (the renamed pager). The mirror is synced and the DONE task records the deferral.

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