Add FROST threshold signing for Orchard spends#150

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zmanian wants to merge 8 commits into

zmanian:frost-tests-and-docs

Commits on Feb 8, 2026

Add FROST integration tests and walkthrough documentation

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Add FROST-to-Zcash bridge tests for FVK construction and signature conversion

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Commits on Feb 9, 2026

Document FROST test suite in walkthrough, including wallet bridge tests

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Add FROST threshold signing implementation for Orchard spends

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Fix security, correctness, and robustness issues across FROST implementation

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Remove alpha_hex leak, reduce PCZT parses, add validation tests

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Fix remaining code review issues: stdin, async, UX, and refactoring

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Zeroize signing share on drop, harden DKG input handling

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