feat(rag): chunk evidence identity, dedup, and search port

Preserve same-document multi-chunk evidence with evidenceKey identity, per-document caps, retrieve-k/return-n split, and a dense KnowledgeSearchPort. Archives Delivery 1 OpenSpec change as the foundation for hybrid retrieval.
2026-07-27 18:26:15 +08:00
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+# Evidence: rag-chunk-evidence-identity-dedup
+
+## 代码证据（变更前）
+
+- `KnowledgeEvidencePostProcessor.sourceKey` 使用 source/title 去重
+- `RagResultProjector` 用 source 回退 document_id 并 HashSet 去重
+- 写入路径 metadata 已有 docId/chunkIndex，读路径未一等化
+
+## 规格证据
+
+- 旧 `openspec/specs/rag-knowledge-retrieval` 要求 source 级 dedup（本 change 以 delta 修正）
+- `docs/milvus-hybrid-search-integration-checklist.md` §1.1 定义 Delivery 1 地基
+
+## 验证证据
+
+- 单测覆盖 multi-chunk keep / true-dup merge / maxChunksPerDocument / projector same-source multi-chunk