Prepare v0.2.1 release

[JulienTant]

Summary

Release notes for v0.2.1 covering the date-filter work from #21 and the UTC normalization / UX hardening from #23. Also updates skills/SKILL.md with the new --since / --before flags and BLOGWATCHER_SINCE / BLOGWATCHER_BEFORE env vars.

After merge

git checkout main && git pull
git tag v0.2.1
git push origin v0.2.1

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

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Run ID: 5f0d9372-40d3-40e6-ade9-6a7b6d3707b7

📥 Commits

Reviewing files that changed from the base of the PR and between 34886d8 and e2769ca.

📒 Files selected for processing (2)

• docs/release-notes/v0.2.1.md
• skills/SKILL.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release/v0.2.1

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