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c8eba433 - [agents docs] update models.md with class attributes and attention mask (#13665)

[agents docs] update models.md with class attributes and attention mask (#13665) * [agents docs] update models.md with class attributes and attention mask guidance - Add "Model class attributes" section documenting _no_split_modules, _repeated_blocks, _skip_layerwise_casting_patterns, _keep_in_fp32_modules, _cp_plan, and _supports_gradient_checkpointing with their corresponding user-facing APIs and how they work - Improve attention mask guidance: recommend passing None when no real padding exists, document backend compatibility - Move _no_split_modules from gotchas to its own section with first-principles explanation of why it's needed (accelerate device hooks) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> * update review-rules, ask to help identify unused code path --------- Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>