The M4TR1X ACC0UNTS section described the pre-heartbeat state: a
snapshot 'written at startup / rewritten each daemon (re)start' with an
'ambiguous' as_of, and the live-status dot as a 'dashboard-side
follow-up'. All three shipped since:
- the daemon now force-rewrites the snapshot every ~30s (heartbeat), so
as_of advances while alive and a stalled value is an honest dead-daemon
signal — documented, with the full dot state table (green / dim-green
'no heartbeat' age case / amber container-down + offline / grey);
- the login endpoint moved to /api/matrix-account-login and its failure
body is RFC 9457 application/problem+json (message in detail), not the
old 4xx { error } — corrected, with the 400/500 status scheme.
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