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Add ECDH command - #88
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- ecdh(public_key, path) returns the 32-byte X coordinate of the shared point - INS 0xC5, P1 0x01, P2 0x00, data = uncompressed peer key + path - The card limits paths to the NIP-44 and EIP-1581 subtrees
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Closes #74
ecdh(public_key, path): INS0xC5, P10x01, P20x00, data = 65-byte uncompressed peer key + path; returns the 32-byte X coordinate, a raw secret for the caller's KDF0x04, or a relative path, raisesValueErrorbefore sending, since a wrong key length would shift the path the card reads0x6985) and rejects points off the curve (0x6A80); both surface asAPDUErrorAPDUError0x6D00