k12: add `Kt256`; rename `KangarooTwelve` to `Kt128`#756

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tarcieri merged 1 commit intoRustCrypto:masterfrom

sorairolake:feature/kt256

Jan 12, 2026

Commits on Nov 6, 2025

feat(k12)!: Implement KT256
sorairolake
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