Nothing persisted agent heartbeats before: companion_last_seen was
written once at setup and connection_status stayed 'connected' forever.
HostAgentConsumerService now consumes corrosion.*.host.heartbeat
(updates last_seen + status, auto-creates the bare_metal connection row
on first contact), host.going_offline (graceful offline), and sweeps
connections offline after 180s of heartbeat silence. License-existence
tenant validation with caching per NATS-consumer doctrine. WS bridge
forwards host_heartbeat/host_going_offline to the panel.
Contract-verified against production NATS with the backend's own nats
lib: v2 subjects, schema 2, real telemetry, offline beacon.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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