The gate's first run failed on a defect the green suite could not see: two public
constructors on ControlPlaneAuthInterceptor made Grpc.AspNetCore's activation
throw per call, so correct key, wrong key and no key all produced identical
errors. Recorded in full because the symptom (Unknown / "Exception was thrown by
handler") points at the handler, not at auth, and because phases 1A/1B both add
services to this same interceptor — they must extend DefaultGatedPrefixes rather
than add a second public constructor.
Also records what the gate does NOT cover: live streaming under load, key
rotation on a running pair, and docker-env2 (keyed but neither redeployed nor
gated).
Joseph Doherty