test: add rag retrieval baseline

eval/rag-retrieval/reports/.gitkeep

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+

eval/rag-retrieval/reports/baseline.json

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+{
+  "generatedAt": "2026-07-04T17:59:52.172759+00:00",
+  "caseFile": "eval/rag-retrieval/cases/golden-cases.json",
+  "fixtureDir": "eval/rag-retrieval/fixtures",
+  "aggregate": {
+    "caseCount": 6,
+    "topK": 5,
+    "strongHitCount": 6,
+    "mediumHitCount": 0,
+    "weakHitCount": 0,
+    "missCount": 0,
+    "recallAtK": 1.0,
+    "strongHitRate": 1.0,
+    "averageFirstHitRank": 1.0
+  },
+  "results": [
+    {
+      "caseId": "chat-mysql-connection-pool",
+      "scenario": "chat",
+      "query": "MySQL connection pool is exhausted. How should I diagnose it?",
+      "hitLevel": "strong",
+      "passed": true,
+      "firstExpectedRank": 1,
+      "topCandidates": [
+        "1:mysql-connection-pool",
+        "2:incident-diagnosis-flow"
+      ],
+      "matchedKeywords": [
+        "connection pool",
+        "max_connections",
+        "hikaricp"
+      ],
+      "breadcrumbMatched": true,
+      "failedChecks": []
+    },
+    {
+      "caseId": "chat-diagnosis-flow",
+      "scenario": "chat",
+      "query": "What is the standard troubleshooting flow for an application incident?",
+      "hitLevel": "strong",
+      "passed": true,
+      "firstExpectedRank": 1,
+      "topCandidates": [
+        "1:incident-diagnosis-flow",
+        "2:rag-chunk-context-reconstruction"
+      ],
+      "matchedKeywords": [
+        "collect evidence",
+        "verify",
+        "remediation"
+      ],
+      "breadcrumbMatched": true,
+      "failedChecks": []
+    },
+    {
+      "caseId": "aiops-payment-latency-alert",
+      "scenario": "aiops",
+      "query": "Alert HighLatency on payment-service with p95 latency above threshold",
+      "hitLevel": "strong",
+      "passed": true,
+      "firstExpectedRank": 1,
+      "topCandidates": [
+        "1:payment-service-latency",
+        "2:mysql-connection-pool"
+      ],
+      "matchedKeywords": [
+        "p95 latency",
+        "payment-service",
+        "downstream dependency"
+      ],
+      "breadcrumbMatched": true,
+      "failedChecks": []
+    },
+    {
+      "caseId": "aiops-prometheus-alert-scope",
+      "scenario": "aiops",
+      "query": "When an AIOps request already includes alert payload, should the agent diagnose unrelated active alerts?",
+      "hitLevel": "strong",
+      "passed": true,
+      "firstExpectedRank": 1,
+      "topCandidates": [
+        "1:aiops-alert-scope-control"
+      ],
+      "matchedKeywords": [
+        "payload",
+        "unrelated active alerts",
+        "scope"
+      ],
+      "breadcrumbMatched": true,
+      "failedChecks": []
+    },
+    {
+      "caseId": "chat-rag-chunk-context",
+      "scenario": "chat",
+      "query": "If a long section is split into multiple chunks, how do we keep retrieval context?",
+      "hitLevel": "strong",
+      "passed": true,
+      "firstExpectedRank": 1,
+      "topCandidates": [
+        "1:rag-chunk-context-reconstruction",
+        "2:rag-breadcrumb-embedding-gap"
+      ],
+      "matchedKeywords": [
+        "neighbor chunk",
+        "same section",
+        "breadcrumb"
+      ],
+      "breadcrumbMatched": true,
+      "failedChecks": []
+    },
+    {
+      "caseId": "chat-l0-domain-hint",
+      "scenario": "chat",
+      "query": "Should L0 keyword matching decide the final retrieval result?",
+      "hitLevel": "strong",
+      "passed": true,
+      "firstExpectedRank": 1,
+      "topCandidates": [
+        "1:rag-l0-domain-entity-hint",
+        "2:rag-l0-l1-fusion-ranking"
+      ],
+      "matchedKeywords": [
+        "domain detector",
+        "entity extractor",
+        "metadata filter"
+      ],
+      "breadcrumbMatched": true,
+      "failedChecks": []
+    }
+  ]
+}

eval/rag-retrieval/reports/baseline.md

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+# RAG Retrieval Baseline
+
+Generated at: `2026-07-04T17:59:52.172759+00:00`
+
+## Aggregate
+
+| Metric | Value |
+|---|---:|
+| Cases | 6 |
+| Top K | 5 |
+| Recall@K | 1.0 |
+| Strong hit rate | 1.0 |
+| Strong hits | 6 |
+| Medium hits | 0 |
+| Weak hits | 0 |
+| Misses | 0 |
+| Average first hit rank | 1.0 |
+
+## Cases
+
+| Case | Scenario | Hit | First Expected Rank | Top Candidates | Failed Checks |
+|---|---|---|---:|---|---|
+| chat-mysql-connection-pool | chat | strong | 1 | 1:mysql-connection-pool<br>2:incident-diagnosis-flow |  |
+| chat-diagnosis-flow | chat | strong | 1 | 1:incident-diagnosis-flow<br>2:rag-chunk-context-reconstruction |  |
+| aiops-payment-latency-alert | aiops | strong | 1 | 1:payment-service-latency<br>2:mysql-connection-pool |  |
+| aiops-prometheus-alert-scope | aiops | strong | 1 | 1:aiops-alert-scope-control |  |
+| chat-rag-chunk-context | chat | strong | 1 | 1:rag-chunk-context-reconstruction<br>2:rag-breadcrumb-embedding-gap |  |
+| chat-l0-domain-hint | chat | strong | 1 | 1:rag-l0-domain-entity-hint<br>2:rag-l0-l1-fusion-ranking |  |