契约测试：测试策略和夹具
消费者的期望，包括身份验证和错误格式，会在合并前通过 CI 在真实提供者上进行验证；合同双方都不能通过模拟来忽略 HTTP 状态码。
Flaky tests enter an owned quarantine record with deadline and retry budget; required CI gates stay honest by reporting quarantined failures separately instead of silently turning green.