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# Chat Diagnosis StateGraph ChatService Cutover Evidence
## 证据
| 来源 | 证据 | 结论 | 是否已汇报 |
|---|---|---|---|
| `ChatService` + source isolation search | 复杂路径只有一次 Graph runtime 调用,无 SequentialAgent、VerifierContextHolder、VerifierInputHook 或 score retry | 单轨 cutover 完成,简单 Chat 路径未改 | 是 |
| `ChatDiagnosisGraphRuntimeTest` / `DiagnosisRealGraphIntegrationTest` | query-only state、runId thread/metadata、Composer/Fallback、empty stream、blank answer、partial trace、Gatekeeper once/twice | Graph identity、路由和真实 partial-state 边界可观察 | 是 |
| `DiagnosisGraphResultMapperTest` / `ChatVerifierPromptContractTest` | verified projection、effective verdict 兼容、pre-verification 无伪 verdict、禁用 raw/full trace 字段 | self-evaluation 与 Prompt 安全边界一致 | 是 |
| `ChatServiceGraphIntegrationTest` | ChatResult、agent_flow、SUCCESS/Fallback/FAILED、metrics/Eval、partial trace、多 Run 隔离 | 生产生命周期与兼容返回满足阶段 3 规格 | 是 |
| `DiagnosisTraceServiceTest` | `run.orchestrationTrace` 解析对象、top/session 无重复、invalid/null fail closed | Trace 字段所有权保持 Run 隔离 | 是 |
| `DiagnosisRunSchemaContractTest` | V012 executable SQL 与唯一允许语句精确相等 | schema 仅增加一个 nullable JSON 列 | 是 |
| focused Maven suite | 27 suites / 119 tests,0 failures/errors/skipped | Graph、Controller、Repository、Gatekeeper、Composer、Eval 回归通过 | 是 |
| OpenSpec/static gates | change strict、14/14 主 specs、test compile、diff check、禁用引用/占位/schema whitelist 全通过 | 规格、编译和源级隔离闭环 | 是 |
## Evidence-driven 结论
- orchestration trace 必须独立于 self-evaluation 和详细 Agent/tool Trace;V012 与 RunTrace 的实现保持这一边界。
- handled Fallback 表示安全降级答案,Run 仍为 SUCCESS;未处理、空答案或 invariant 失败才是 FAILED。
- Verifier/Gatekeeper 只以显式 Graph state 传递可信材料;继续使用 Hook/ThreadLocal 会形成双 Gatekeeper 和不安全输入,因此生产路径已彻底移除该依赖。
- 旧 Sequential 测试验证的是已废止内部机制,替换为 public service + runtime + route contract tests 才能保持真实回归价值。