Q4_K weights previously hit the "Unsupported weight type for NPU pipeline"
assert and fell back to CPU. Route them through dequantize_row_q4_K and map
GGML_TYPE_Q4_K to W4A4_HADAMARD, matching the existing Q4_0 handling.
Note: W4A4_HADAMARD is the lower-accuracy of the two W4A4 pipelines
(bench: 3.17 vs 3.43 tg64 for standard). This is an enablement, not a
performance choice.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EWpfhDgYNA21tETDP9ueBE
mfritsche
137b4ceebe