`openclaw gateway stop` resolved the unmanaged fallback port from config and
discovered pids through lsof only. On hosts without lsof, and whenever the
gateway runs on a port other than the configured one, discovery came back empty
and the command reported `Gateway service disabled.` with `ok:true` and exit 0
while the gateway kept serving.
The gateway lock already holds the verified owner pid and port. Restart learned
to read the lock port in #105241 to keep an unmanaged restart honest when the
configured port drifts; stop's fallback never did. Read the lock identity once in
the not-loaded fallback, use its port for discovery, and signal its owner when no
listener is found. Verified listeners still win when lsof is available.
Signalling still goes through `signalVerifiedGatewayPidSync`, which re-reads argv
immediately before SIGTERM, and lock identities are only returned after a
liveness and start-time or argv check, so dead, recycled, port-less and
non-gateway lock owners are refused and the command stays `not-loaded`.
Closes#72948
6fb3aae404