Expand diagnosis eval fixtures

mvp/eval/cases/diagnosis-cases.json

@@ -25,7 +25,7 @@
     "id": "redis-timeout",
     "title": "Redis timeout",
     "question": "支付服务出现 Redis 连接超时，请定位可能原因。",
-    "traceFixture": "redis-timeout-missing.json",
+    "traceFixture": "redis-timeout-low-confid.json",
     "expectedRootCauseKeywords": ["redis", "超时"],
     "minKeywordMatches": 2,
     "requiredEvidenceTools": ["query_logs"],
@@ -36,7 +36,7 @@
     "id": "slow-response",
     "title": "Slow response",
     "question": "用户服务 P99 响应时间升高，请结合指标和日志分析。",
-    "traceFixture": "slow-response-missing.json",
+    "traceFixture": "slow-response-pass.json",
     "expectedRootCauseKeywords": ["p99", "慢响应"],
     "minKeywordMatches": 1,
     "requiredEvidenceTools": ["query_metrics", "query_logs"],
@@ -47,7 +47,7 @@
     "id": "jvm-memory-risk",
     "title": "JVM memory risk",
     "question": "订单服务内存使用率过高，请判断是否存在 OOM 风险。",
-    "traceFixture": "jvm-memory-risk-missing.json",
+    "traceFixture": "jvm-memory-risk-low-confid.json",
     "expectedRootCauseKeywords": ["jvm", "内存", "oom"],
     "minKeywordMatches": 2,
     "requiredEvidenceTools": ["query_metrics", "query_logs"],