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>
Joseph Doherty
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