Upstream PRs 1824, 1777, 1834#21

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Commits on Feb 16, 2026

util: introduce and use `ARRAY_SIZE` macro
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Commits on Mar 4, 2026

Merge bitcoin-core/secp256k1#1777: Make SHA256 compression runtime pluggable
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Commits on Mar 11, 2026

ecmult: Document and test ng=NULL in ecmult
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eckey: Call ecmult with NULL instead of zero scalar
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Merge bitcoin-core/secp256k1#1834: ecmult: Document and test ng=NULL in ecmult
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