[New quant] Q3_PT#19941

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pwilkin wants to merge 9 commits intoggml-org:masterfrom

Commits on Feb 26, 2026

Q3_PT
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Missing renames
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Commits on Feb 27, 2026

Q3_KPT
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Commits on Feb 28, 2026

Q4_DPT (= IQ4_NL with trained kvalues)
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Commits on Mar 1, 2026

Commits on Mar 4, 2026

PROPER handling of level passing. So good that ggml_tensor had some free padding at the end :)
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Commits on Mar 13, 2026

Q2_DPT, per superblock scales
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