Summary

• add an optional linuxdo channel with exact linux.do hostname routing and real linuxdo-reader -h health probing
• install pinned linuxdo-reader v0.3.1 in an isolated Python 3.11+ uv tool, then run Chromium installation through that exact tool environment's Playwright executable
• require both the CLI and its Chromium browser fallback to be ready in doctor, with one complete agent-reach install --channels=linuxdo repair command
• document and test the crawl -> digest, hydrate -> topic, cached-search, untrusted-input, and fetch-completeness contracts

Validation

• PYTHONPATH=. pytest tests/ -v (209 passed)
• ruff check agent_reach/channels/linuxdo.py tests/test_cli.py tests/test_linuxdo_channel.py
• ruff check agent_reach/cli.py --select E,F --ignore E501,F541,E741
• git diff --check
• isolated release smoke:
  • uv tool install 'git+https://github.com/kadaliao/linuxdo-reader.git@v0.3.1' --with playwright --force
  • linuxdo-reader -h
  • linuxdo-reader crawl -h
  • linuxdo-reader hydrate -h

The smoke resolved v0.3.1 to commit 27c2da20b6891873535b51f598dff71d4fe64163, installed linuxdo-reader==0.3.1, and confirmed the installed distribution contains its MIT LICENSE. It did not download Chromium or access Linux.do.

Risk

The previous license blocker is resolved: pinned linuxdo-reader v0.3.1 includes a standard MIT LICENSE, SPDX MIT package metadata, and the MIT license classifier. The integration remains optional and pinned; it does not import upstream Python internals or add MCP reading tools.

Real Chromium download/browser launch and real Linux.do crawling remain intentionally unverified in this PR validation to avoid a large browser download and external site access.