Release v0.3.0

PyPI: erm 0.3.0

What's Changed

• chore: pin all GitHub Actions to commit SHAs by @dougcalobrisi in #5
• feat: render modes (remove/silence) + pause spacing knobs by @dougcalobrisi in #6
• fix: align render() crossfade defaults with CLI defaults by @dougcalobrisi in #8
• docs: internals design docs + usage/tuning guides by @dougcalobrisi in #7
• docs: publish docs to GitHub Pages (MkDocs Material) by @dougcalobrisi in #9
• feat: default Whisper model to large-v3 by @dougcalobrisi in #11
• feat: Claude Code/Cowork plugin for erm (install, use, tune) by @dougcalobrisi in #10

Full Changelog: v0.2.0...v0.3.0