cv-train-stack

CV model training review and execution. Covers dataset validation, preprocessing consistency, augmentation strategy, training configuration, export/quantization, and deployment validation. Use when training classifiers, YOLO detection/segmentation, or any CV model. Use when: "train model", "retrain", "training review", "check training config", "prepare training", "cv training", "model training". Proactively suggest when the user is about to train a model or has just finished training.