* upstream/main: (39 commits)
  Remove deprecated training args and `is_fast` property (huggingface#46917)
  Consistent output shape from `get_image_features` (huggingface#46405)
  Fix multi-device mxfp4 dequantization race in `_convert_moe_packed_tensors` (huggingface#47423)
  fix failed test cases for qwen3_omni_moe model (huggingface#47449)
  Fix Hunyuan-VL PIL image resize parity with reference preprocessing (huggingface#47233)
  Move `value` padding into the attention interfaces that need it (huggingface#47451)
  Simplify function dispatch for linear attention (huggingface#47450)
  [cache] Allow sliding window layers to be roll-backed for speculative decoding (huggingface#47447)
  Fix double-shifted training loss in GitForCausalLM (huggingface#47395)
  Fix CohereASR training-loss double-shift (same as Moonshine fix huggingface#46784) (huggingface#46895)
  Warn when `group_by_length` is silently ignored for iterable datasets (huggingface#47379)
  Update bug report list (huggingface#46607)
  Fix shape mismatch in KyutaiSpeechToText `generate()` last window (huggingface#46952)
  Optimize flash attention max seqlen computation in vision attention (huggingface#47170)
  fix: remove unreachable return in special token builder (huggingface#47420)
  Add Harry to slow CI (huggingface#47454)
  BLT: vectorize patch length processing (huggingface#47385)
  Fix `TrackioCallback` fails to log evaluation metrics after training ends (huggingface#46935)
  [Kimi] add integration tests (huggingface#47383)
  Fix typo in `MusicgenForCausalLM.generate()` (huggingface#46974)
  ...