搜索工具调研与安装：neo-ddg-search已安装并集成到学习机制

- 创建search-tool-research.md：记录clawdhub搜索工具调研
- 安装neo-ddg-search：DuckDuckGo Web Search，免费无需API密钥
- 更新learning-notes.md：添加搜索工具学习和clawdhub使用
- 添加工具学习启发：开源优先、多工具备选、持续学习工具
- 更新今日指标：+1搜索工具、+2学习相关文档
- 承诺：使用neo-ddg-search支持自主学习和资料收集

skills/neo-ddg-search/SKILL.md

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+---
+name: ddg-search
+description: Search the web using DuckDuckGo. Free, no API key required. Use when the user asks to search the web, look something up, find information online, research a topic, or when you need to find current information that isn't in your training data. Also use when web_search tool is unavailable or has no API key configured.
+---
+
+# DuckDuckGo Web Search
+
+Search the web via DuckDuckGo using the `ddgs` Python library. No API key needed.
+
+## Quick Usage
+
+```bash
+python3 skills/ddg-search/scripts/search.py "your search query" [count]
+```
+
+- `query` (required): Search terms
+- `count` (optional): Number of results, default 5, max 20
+
+## Output Format
+
+Each result includes:
+- **Title** — Page title
+- **URL** — Direct link
+- **Snippet** — Text excerpt
+
+## Examples
+
+```bash
+# Basic search
+python3 skills/ddg-search/scripts/search.py "latest AI news"
+
+# More results
+python3 skills/ddg-search/scripts/search.py "Python async tutorial" 10
+```
+
+## Follow-up
+
+After searching, use `web_fetch` to read full content from any result URL.
+
+## Dependencies
+
+- `ddgs` Python package (install: `pip install --break-system-packages ddgs`)
+
+## Limitations
+
+- Unofficial scraping — may break if DuckDuckGo changes their frontend
+- Rate limits possible under heavy use
+- English-biased results by default