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membership/auth_test: golden (signed+registered accepted), error paths (unregistered 401, replayed nonce 401, clock skew 401, tampered body 401, missing headers 401), exemptions (healthz, soft allows, off no-op). client_test: end-to-end with the real client against an enforce server — registered peer accepted, unregistered rejected, revoked peer denied without a server restart. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>