feat(phase3): PyTorch→MLX weight converter (#1)
* feat(phase3): PyTorch→MLX weight converter + safetensors output
365 keys mapped (367 source - 2 num_batches_tracked skipped).
Conv weights transposed (O,I,H,W→O,H,W,I), refiner stem remapped,
4ch patch embed preserved. 12 conversion tests + diagnostic report.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
* fix(phase3): conv allowlist, unused var, test fixture
- Replace _is_conv_weight heuristic with explicit CONV_WEIGHT_KEYS frozenset (15 keys)
- Remove unused `skipped` list from convert_state_dict
- Module-scoped pytest fixture eliminates 11 redundant checkpoint loads
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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