v0.2.0

Changelog

• 2d57862 Merge pull request #4 from yebiguo/v0.2-github-action
• 604fed4 docs: document the GitHub Action and its known limitation in both READMEs
• 3ae2aac release: prep v0.2.0 — pin the Action's binary version to this release
• 8db5af7 v0.2 Day 2: action.yml composite action + dogfood workflow
• a844265 v0.2 Day 4: automate the v1 floating tag, document the Action in AGENTS.md
• 1d520e3 v0.2: fix two MUST-FIX false-PASS gaps from external review + harden action.yml
• b200d60 v0.2: harden checksums.txt parsing against CRLF line endings
• c360619 v0.2: pin the Action's binary version literally instead of guessing from action_ref
• 53fe975 v0.2: run dogfood across ubuntu/macos/windows, not just ubuntu
• 39fdefa v0.2: strip stray backslash from sha256sum output on Windows runners