v0.19.0

What's Changed

• feat(skill): extend no-mistakes skill with tests, playwright, fetches, and lockfile by @jonathanong in #315
• fix(install): retry postinstall downloads on transient HTTP failures by @jonathanong in #316
• feat(rule): github-actions-pinned-hash by @jonathanong in #317

Full Changelog: v0.18.0...v0.19.0