- Fix container registry region nl-ams → fr-par across all CI jobs
- Add sccache build-args to training image build (no-op fallback for local)
- Add rclone to training Docker runtime for S3 output sync
- Update train.sh: S3 sync on Job completion via rclone env-var config,
--run-id tracking, evaluate preset for walk-forward evaluation
- Add s3-credentials Secret template (.example, apply via kubectl)
- Add design doc and implementation plan
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>