Task 75807069368

refactor, key: move `CreateMuSig2{Nonce,PartialSig}` functions to `musig.{h,cpp}` module

2026-05-13 14:27:33 completed 202601-move-musig-funcs-to-module 8ba5f68b1df99350aa037a644041034cf46842dc

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[meta] record frozen commit

202601-move-musig-funcs-to-module