fix(triage-intake): Signal is Emacs-only — remove the standalone receive path

Craig's ruling, correcting this morning's plugin: signel and standalone signal-cli share the same account config and device queue, so a standalone drain steals messages the Emacs client would otherwise show him. Step 0 now starts signel via cj/signel--ensure-started when it's down and leaves it running (a live signel is the steady state, so no teardown). signal-cli survives only for queue-untouching reads like listAccounts; the SCAN FAILED rule covers signel failing to start.

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