feat(knowledge): 完成 L0+L1 混合检索集成

核心功能:
- 新增 FrontmatterParser 解析 YAML frontmatter
- 新增 KnowledgeIndexService L0 内存索引
- 新增 LookupKnowledgeTool 混合检索工具
- 增强 DocumentManagementService 文件保存和索引同步

技术实现:
- 数据库迁移 V004: api_document.metadata (TEXT)
- 依赖新增: snakeyaml 2.0
- 配置新增: knowledge.base-path
- 可观测性: requestId 追踪 + 性能日志

质量保证:
- 单元测试: 31/31 通过
- 测试覆盖: FrontmatterParser(11), KnowledgeIndexService(13), LookupKnowledgeTool(7)
- 启动验证: L0 索引正常加载

归档文档:
- OpenSpec: openspec/changes/lookup-knowledge-integration/
- devflow 档案: devflow/projects/2026-06-24-lookup-knowledge-integration/
- handoff: handoff/2026-06-24-lookup-knowledge-integration.md
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zhuyongxin
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# Lookup Knowledge Integration - 归档总结
## 变更状态
**✅ 已完成并归档**
- **完成日期**: 2026-06-24
- **OpenSpec**: `openspec/changes/lookup-knowledge-integration/`
- **Handoff**: `handoff/2026-06-24-lookup-knowledge-integration.md`
## 交付内容
### 核心功能 ✅
1. **FrontmatterParser** - YAML frontmatter 解析
2. **KnowledgeIndexService** - L0 内存索引(启动扫描 + 精确匹配)
3. **LookupKnowledgeTool** - L0+L1 混合检索工具
4. **DocumentManagementService 增强** - 文件保存 + L0 索引同步
### 数据库变更 ✅
- **V004 迁移**: api_document.metadata (TEXT)
### 测试 ✅
- **单元测试**: 31/31 通过
- **启动验证**: 应用成功启动,L0 索引正常加载
### 可观测性 ✅
- **requestId 追踪**: 8 位 UUID
- **性能日志**: L0/L1/总耗时
- **文档**: `.docs/knowledge-observability.md`
## 关键指标
- **L0 查询耗时**: < 10ms
- **L0+L1 总耗时**: < 500ms
- **单元测试覆盖率**: > 80%
## 文档索引
- 📄 **Proposal**: `openspec/changes/lookup-knowledge-integration/proposal.md`
- 📄 **Design**: `openspec/changes/lookup-knowledge-integration/design.md`
- 📄 **Specs**: `openspec/changes/lookup-knowledge-integration/specs/functional-specs.md`
- 📄 **Tasks**: `openspec/changes/lookup-knowledge-integration/tasks.md`
- 📄 **Decisions**: `openspec/changes/lookup-knowledge-integration/decisions.md`
- 📄 **Handoff**: `handoff/2026-06-24-lookup-knowledge-integration.md`
- 📄 **Observability**: `.docs/knowledge-observability.md`
## 后续工作
无阻塞性工作。
**可选增强**(Phase 2):
- 章节锚点功能
- L0 索引持久化
- 批量导入工具
---
归档完成 ✅