Two evict/corruption fixes surfaced by review of the diffusion training path:
- krea-2 sets force_bf16 in the DiT trainer spec, but the route-level
_FORCE_BF16_FAMILIES preflight listed only qwen-image and z-image, so a
krea-2 start with mixed_precision=fp16 passed the route check, reserved
training and evicted resident GPU models, and only the child trainer then
raised. Add krea-2 to the set and a drift-guard test asserting it equals
the trainer specs whose force_bf16 is set.
- The dataset-upload same-stem duplicate check compared stems
case-sensitively, so on case-insensitive filesystems (Windows / default
macOS) sample.png and Sample.jpg both passed even though their caption
sidecars sample.txt / Sample.txt resolve to the same file, silently
sharing and corrupting one caption. Compare stems and the same-name guard
with casefold at both the on-disk and in-batch sites.
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