chore(pasta): lazy point x86-64 assembly experiment - #237
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* Share the portable Pasta field squaring primitive Move the identical pure-Rust wide-squaring routine used by Fp and Fq into a private limb-array helper. Each field retains its existing Montgomery reduction and all other arithmetic paths. * Use the low-half squaring reduction on x86-64 Cancel the low half of portable square products before adding the high half, matching the dependency shape of the Apple assembly implementation. Select this path only on x86-64; other architectures retain their existing classical reduction, and multiplication is untouched. * Skip corrections within portable squaring chains Keep portable repeated-squaring accumulators below twice the field modulus and canonicalize only at the end of a chain. Specialize the x86-64 lazy reducer for the shared Pasta modulus shape, while retaining the Apple AArch64 assembly paths.
TalDerei
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Stacks on #222.
Adds lazy x86-64 Pasta point arithmetic: additions improve 0.5–1.7%, but doubling slows 4–5%, scalar multiplication 1%, and GLV 2.2–2.4%.