docs(mvp): update RAG docs for py-rag extraction
- rewrite RAG architecture doc for py-rag service contract mapping, ingest and rebuild ops - refresh observability/trace doc for post-L0 single-attempt semantics - add py-rag chain exploration note; mark superseded Milvus/L0 notes with status banners - close ISS-017 (superseded by L0 sinking); mark knowledge_domain table orphaned - refresh architecture/mvp/engineering indexes
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# 知识域表:knowledge_domain
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**状态**:当前表
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**状态**:孤儿表(2026-09-29 RAG 抽离后无写入方)
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**来源**:`V009__add_knowledge_domain.sql`、`KnowledgeDomain`
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> **2026-09-29 变更**:本表的写入方 `KnowledgeDomainService` 已随 RAG 模块抽离删除
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> (L0 domain 分析下沉 py-rag)。表结构由 Flyway 保留(`ddl-auto: validate`),当前无读写方,
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> 待后续迁移清理。历史数据仅供追溯。
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## 定位
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`knowledge_domain` 保存知识库领域级元数据,为 RAG backend 的 domain hint、检索选择和可观测性提供基础信息;它不是 Agent-facing Tool contract。
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