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ops - refresh observability/trace doc for post-L0 single-attempt semantics - add py-rag chain exploration note; mark superseded Milvus/L0 notes with status banners - close ISS-017 (superseded by L0 sinking); mark knowledge_domain table orphaned - refresh architecture/mvp/engineering indexes
2026-09-30 17:03:50 +08:00
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 # Harness 整体架构学习笔记：从装配到入口到记忆到知识库写入

+> **现状说明（2026-09-29）**：RAG 模块抽离后，本文「知识库写入链路」章节描述的
+> `KnowledgeIndexService` / Milvus 写入路径已删除（入库下沉 py-rag `documents:ingest`）；
+> 其余装配/入口/记忆章节仍现行。当前架构见
+> [../../architecture/RAG知识检索架构.md](../../architecture/RAG知识检索架构.md)。
+
 **更新日期**：2026-08-04
 **主题**：整体架构五块补充（了解层面）——配置装配中心 / HTTP 入口层 / 会话系统与记忆体系 / 知识库写入链路
 **配套**：九域主线笔记（core/retry/progress/tool/guard/release/agent/audit/contract 全 ✅）