Add test_fp8_min_max_helper.py with mocked unit tests that verify:
- Standard FP8 dtype uses PyTorch's finfo values
- fnuz dtype on fnuz platform (MI300) returns 224.0, not 240.0
- Standard dtype on fnuz platform uses finfo values
- fnuz dtype on non-fnuz platform uses finfo values
These tests use mocking to verify the logic without requiring
actual ROCm hardware.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: c0de128 <kevin.mckay@outlook.com>
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