AES-256-GCM requires 32-byte key. 'None' placeholder is only 4 bytes, causing ValueError during callback decryption instead of at startup. Now fails fast with clear error if key is missing/invalid.
AES-256-GCM requires 32-byte key. 'None' placeholder is only 4 bytes, causing ValueError during callback decryption instead of at startup. Now fails fast with clear error if key is missing/invalid.