The bell reported 🔔 iff wake-listener-<handle>.lock named a live pid — one
MECHANISM, not the property it stands for. Correct while the FIFO waiter
was the only channel; wrong the moment 3.3.0 added `cc`. This seat is
reachable over its Claude Code socket, has no waiter lock at all, and was
rendering 🔕 while the post office reported push/reachable. Pane-routed
seats were wrong the same way before that.
It now reads `reachable` from the status payload it was already fetching
and discarding, which means the segment knows nothing about althing's
internals — no lock paths, no channel names — so a fourth channel cannot
make it stale.
Adds the third state: an unreachable post office rendered identically to a
healthy seat with no mail. It is 📵 now. An outage is not an empty inbox,
including on the status line.
Also retires a `kill -0` liveness check, the third instance of
liveness-standing-in-for-identity found on this object tonight.
Verified in all three states: 🔔 on this seat, 📵 against a dead address,
📬 4 🔕 on a pull-only handle.
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