Merge feature/github-oauth: brokered GitHub sign-in for code.sigit.si

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Seto Elkahfi committed Jun 30, 2026 at 22:50 UTC 027585944891d4b6dbfee4bae30dea05255ed9ce

No changes.