feat: support NUT-28 P2BK#950

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KvngMikey wants to merge 4 commits intocashubtc:mainfrom

KvngMikey:support_p2bk

Commits on Mar 26, 2026

feat(p2bk): implement NUT-28 Pay-to-Blinded-Key
KvngMikey
committed

Commits on Apr 6, 2026

Commits on Apr 9, 2026

chore: HTLC inheritance, multisig slot independence, per-key ECDH hardening, negative test coverage
KvngMikey
committed