PQ Backup FINAL VER 0x10 79 bytes 108 chars FIXED 1 attempt CRC16 pre-KDF
Structure: [1 VER=0x10 | 2 CRC16(salt+iv+ct) | 16 salt | 12 iv | 48 ct] = 79 bytes. Base58 length is ALWAYS 108 for VER 7..255 → no grind. PBKDF2 200k + AES-GCM.
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