- Remove upload-artifact step (unsupported on Gitea GHES)
- Replace architecture+audit jobs with unified validate job running validate_all.py
- Update docs: DEPLOY_HOST must be 172.17.0.1 (Docker bridge), not 127.0.0.1
- Add ufw rule for Docker bridge network SSH access
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>