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gateway.md describes the always-on GatewayAlarmMonitor, the session-less StreamAlarms feed, and session-less AcknowledgeAlarm. DesignDecisions.md records that the v1 "one subscriber per session / no fan-out" rule is superseded for the alarm subsystem: alarm state is gateway-wide, so the gateway monitors it centrally and fans it out to all clients. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>