Let the swap hand every module the same storage
`FineGrainedGroupedLinear` took `block_size`/`activation_scheme`/`scale_fmt` but
not `weight_format`/`activation_format`, so it silently built its parent's fp8
default -- right for DeepSeek-V4's block-FP8 grouped linears today, wrong the
moment a group says otherwise. It takes the pair now, which is also what let the
swap drop the comprehension that picked three keys back out of `storage_for`:
all three branches pass the same mapping.
The experts branch was 27 of the dispatch's 40 lines, so the dispatch itself was
the hard part to find. `_quantized_experts` holds the flags-twice-over dance and
the post-norm carry-over, and the three-way choice now reads at a glance.
`FineGrainedQuantize`'s docstring still said shapes that don't tile pass
through, which stopped being true when the block quantizer learned to pad. It
names `_weight_holder` as what actually decides, since rank does not.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
