mattlin1124

Fix: add ensure_channel_first in utils and integrate into DiceHelper (refs #8366)

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What does this PR do? Adds ensure_channel_first utility in monai/metrics/utils.py and integrates it into DiceHelper.__call__ in monai/metrics/meandice.py to normalize input tensors to channel-first layout before Dice computation. This prevents metric...

BUGFIX: support NDHWC input in sliding_window_inference and DiceMetric

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What Move ensure_channel_first to monai/utils/tensor_utils.py and re-export from inferers/utils.py for backward compatibility. Update MeanDice channel normalization logic: Use num_classes as authoritative hint when provided. Without num_classes: apply heuristic first, then...

Fix #8366: Add strict shape validation to sliding_window_inference

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### Description This PR addresses issue #8366 by implementing strict shape validation in `sliding_window_inference`. Per the feedback from maintainers (@ericspod), implicit guessing (heuristics) for channel-last data has been avoided. Instead,...