feat: implement stealth addresses for partial unshield change notes#84
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- Generate unique ephSk-derived stealthOwnerPk per unshield (Task 1.4) - Expand memo value to u128 (two u64 LE words) - Update memo wire format to 176 bytes (nonce 12 + ciphertext 132 + ephPk 32) - Add change_encrypted_memo parameter to pallet extrinsic and EVM precompile - Update precompile selector from 0xd21d9a79 to 0xcc1a3b38 (9 parameters) Prevents linkability of partial unshield change notes to user's global ownerPk. Recipients recover via ECDH + HKDF using ephPk embedded in memo. Affected: primitives/encrypted-memo, frame/shielded-pool, frame/evm/precompile
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Prevents linkability of partial unshield change notes to user's global ownerPk. Recipients recover via ECDH + HKDF using ephPk embedded in memo.
Affected: primitives/encrypted-memo, frame/shielded-pool, frame/evm/precompile