chore: 更新项目文档和工具状态

- 更新 AGENTS.md 项目知识库文档（多目录）
- 添加 docs/analyst.md 产品分析文档
- 添加 .omc/ 工具状态和会话记录
- 添加 .sisyphus/ 计划文档
- 添加 project-structure.txt 项目结构
- 删除 timeline 测试截图

docs/AGENTS.md

@@ -0,0 +1,55 @@
+# docs/ - Project Documentation
+
+<!-- Parent: ../AGENTS.md -->
+
+## OVERVIEW
+
+Technical documentation, design plans, and implementation guides for the agent_park project.
+
+## STRUCTURE
+
+```
+docs/
+├── api-reference.md          # API endpoint documentation
+├── api-testing-guide.md      # API testing instructions
+├── discovery-workflow.md     # Project discovery system docs
+├── e2e-testing-guide.md      # Playwright E2E guide
+├── verification-report.md    # Feature verification reports
+├── analyst.md               # Product analysis notes
+├── n8n/                     # n8n workflow documentation
+│   ├── historical-workflow-design.md
+│   ├── incremental-workflow-design.md
+│   └── tag-janitor-workflow.md
+└── plans/                   # Design & implementation plans
+    ├── 2026-01-25-ai-search-system-design.md
+    ├── 2026-01-25-ai-search-implementation.md
+    ├── 2025-01-25-ai-timeline-feature-design.md
+    ├── 2025-01-25-ai-timeline-implementation.md
+    ├── 2026-01-25-keyword-cloud-system-design.md
+    └── 2026-01-25-keyword-cloud-implementation.md
+```
+
+## KEY DOCUMENTS
+
+| Document | Purpose |
+|----------|---------|
+| `api-reference.md` | Complete API documentation |
+| `discovery-workflow.md` | Project discovery architecture |
+| `plans/*.md` | Feature design & implementation specs |
+| `n8n/*.md` | n8n workflow design docs |
+
+## FOR AI AGENTS
+
+### When Adding Documentation
+
+1. Place design docs in `plans/` with date prefix
+2. Update this AGENTS.md with new file entries
+3. Follow existing markdown formatting
+
+### Related Files
+
+- `CLAUDE.md` - Main project context (root)
+- `AGENTS.md` - Project knowledge base (root)
+- `.claude/` - Custom agents & commands
+
+<!-- MANUAL: Additional notes can be added below -->