Function parse_emergency_reset 

pub fn parse_emergency_reset(payload: &[u8]) -> Result<[u8; 32], PayloadError>

Parse the payload of CommandOpcode::EmergencyReset.

Layout: magic (4) || io_key (32). The magic must match EMERGENCY_RESET_MAGIC. No PIN is required since the use case is “PIN and PUK both forgotten / exhausted”.

Returns io_key once the magic is validated.

Errors

• PayloadError::WrongLen if the payload is not exactly 36 bytes.
• PayloadError::MagicMismatch if the first 4 bytes are not EMERGENCY_RESET_MAGIC.