pub fn validate_message_batch(msgs: &[MailboxMessage]) -> Result<(), i32>Expand description
Validate a batch of MailboxMessages without copying their envelopes.
Reads Envelope fields directly from the MailboxMessage array via Zig’s
strided memory walk (Task 4 zero-copy optimisation). This is safe because
MailboxMessage is #[repr(C)] with envelope at offset 0.