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Add an opt-in alarm phase (-VerifyAlarms) to run-client-e2e-tests.ps1: each of the five client CLIs runs stream-alarms (asserting at least one AlarmFeedMessage) and acknowledge-alarm against the gateway's central alarm monitor. Both RPCs are session-less. -AlarmReference and -AlarmStreamMax tune the phase; GatewayTesting.md documents it. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>