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* Initial commit: CLI extraction from yubisignerHEADmaingabrix732026-05-316-0/+517
Extract core signing logic from Stefan Claas's yubisigner GUI into standalone CLI tool for automation workflows. Features: - YubiKey PIV Ed25519 signing (slot 9c) - 4 hash algorithms (RIPEMD-256, SHA-256, SM3, Streebog-256) - Identical signature format to original yubisigner - Command-line interface for scripting All cryptographic functions are verbatim copies from yubisigner.go with original line number references preserved in comments.