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4014d50f - Refine .ai attention-mask and component-mutation guidance from a PR review

Refine .ai attention-mask and component-mutation guidance from a PR review - models.md: clarify padding-mask bullet — pass None when padding is uniform (mask.all()) or when the model is trained to tolerate padding without a mask - pipelines.md: add gotcha #7 — don't mutate registered component state per call; prefer an already-prepared component, otherwise snapshot and restore (PAG pattern) Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>