Cherry-pick PR#2581 and PR#2776 to main#3075

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BestJuly wants to merge 2 commits intoNVIDIA:mainfrom

BestJuly:lit/pick_pr2581_to_main

Commits on Jan 26, 2026

Fix: don't enter branch if mtp_num_layers == 0 (#2581)

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Fix clip_qk for virtual pipeline size > 1 (#2776)

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