Align all 4 Docker images with local dev environment:
- ci-builder: CUDA 12.4.1/Ubuntu 22.04 → 12.9.1/Ubuntu 24.04
- ci-builder-cpu: Debian bookworm → Ubuntu 24.04 (+ explicit rustup)
- foxhunt-runtime: Debian bookworm → Ubuntu 24.04
- foxhunt-training-runtime: CUDA 12.6.3 → 12.9.1, nvrtc 12-6 → 12-9
All images now have glibc 2.39, matching the local build machine.
Binaries compiled locally or in CI will run in any of these containers
without GLIBC_2.3x version mismatch errors.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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