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Update the gateway docs for the central alarm monitor reversal: Grpc.md replaces QueryActiveAlarms with the session-less StreamAlarms RPC and notes AcknowledgeAlarm no longer needs a session; Authorization.md maps StreamAlarmsRequest to events:read; GatewayConfiguration.md adds the MxGateway:Alarms options block; and GatewayDashboardDesign.md points the Alarms page at the central monitor cache instead of a per-session subscription. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>