Re-fix the round-34 CI regression: the round-34 attempt gated the
accelerate preflight on enable_model_cpu_offload, but the parameter
defaults to True so tests that did not explicitly opt out still
hit the missing-accelerate path. Removed the accelerate preflight
entirely; transformers' PyTorch backend already pulls accelerate
as a hard dep on every supported install path, so the duplicate
find_spec guard is redundant in practice and the missing-package
case will still surface a clean ModuleNotFoundError from the
offload code itself if the user somehow lands there without it.
Round 34 P1 cross-block: extend the seed.py multipart filename
validators (round 33) to /api/datasets/upload. Both routes echo
the filename back to the client and persist it, so per the
asymmetric-fix rule the validators must match. Now rejects
control characters and embedded HF tokens in file.filename in
both upload entry points.
86 targeted backend tests pass.
09ca2b27d3