Add Qwen 3.8 27B Megatron support - #810
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Summary
Qwen/Qwen3.8-27Bas a validated Qwen 3.5-family dense Megatron modelWhy
Qwen 3.8 27B has the same model architecture and checkpoint schema as Qwen 3.6 27B, but ART currently rejects it because validated model support is keyed by exact Hugging Face model identifier.
Validation
uv run --extra tensors pytest tests/unit/test_trainer_rank_validation.py -k qwen35_checkpoint_adapter_config_captures_attention_dimensionsuv run prek run --all-files