fix(web): add WebChannel read fallback + docs and tests + stable skil…

[adeyemijosh]

Changes

• WebChannel.read(): Added URL read method with schema normalization, 10s timeout, status checks, error handling, and content truncation (>10k chars).
• Test coverage: Added test_web_channel_can_handle_and_check to verify URL handling and health check.
• Dev docs: Updated README.md and CONTRIBUTING.md with pip install -e . + pytest -q setup steps and ModuleNotFoundError fix hint.
• Robustness: Improved _install_skill() fallback reading (importlib.resources → local file) with UTF-8 encoding.

Validation

• python -m pip install -e .
• python -m pytest -q --maxfail=1
• 74 passed ✅

Type

fix / enhancement to core WebChannel + docs + tests

[Panniantong]

感谢贡献！fallback 机制和 encoding 修复的方向都对，但 read() 的实现与项目设计不符，需要修改：

必须修复：

1. read() 应使用 Jina Reader，而非直接 requests.get()：

   check() 的描述是「通过 Jina Reader 读取任意网页」，但新实现的 read() 完全绕开了 Jina，直接抓取原始 HTML。这会返回未处理的 HTML 给 agent，与项目定位不符。请改为：

   def read(self, url: str) -> str:
       if not url.startswith(('http://', 'https://')):
           url = 'https://' + url
       jina_url = f'https://r.jina.ai/{url}'
       resp = requests.get(jina_url, timeout=30)
       resp.raise_for_status()
       return resp.text

2. read() 方法缺少测试：新增的功能没有对应的单元测试（应 mock requests.get 测试正常和异常路径）。

3. README.md 的修改位置不合适：在 README 顶部新增「开发快速启动」节会打断现有文档结构，且内容与 CONTRIBUTING.md 重复。建议这部分内容移入 CONTRIBUTING.md 或删除。

可保留的改动（很好）：

• _install_skill() 的 try/except fallback 机制 ✅
• 写文件时统一加 encoding="utf-8" ✅
• CONTRIBUTING.md 补充 pytest 步骤 ✅

修复以上三条后请重新请求 review！

[adeyemijosh]

All three requested fixes are now complete:

1. ✅ read() now uses Jina Reader API (https://r.jina.ai/)
2. ✅ Added comprehensive unit tests with mocking (normal + abnormal paths)
3. ✅ Removed duplicate README.md section

All 79 tests pass. Ready for review!