Only trigger on push to main and on pull_request events.
Previously push to any branch + pull_request both fired,
causing every PR push to run CI twice.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Merge fmt, clippy, audit, and tests into one job to eliminate
redundant cargo downloads and dependency compilation
- Update Rust version badge from 1.89 to 1.94 in README
- Redesign sidebar footer: circular avatar, stacked user info
with sign-out link, privacy/impressum footer links
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>