Function rewrap_length_prefixed_handler_response 

pub fn rewrap_length_prefixed_handler_response(
    raw_bytes: &[u8],
    correlation_id: u64,
) -> Frame

Adapt an older 5-byte handler envelope into a RedWire reply frame.

Some in-process fast paths return [u32 length][u8 kind][body...]. RedWire uses the same message-kind discriminator for kind, but owns the outer frame header. This helper keeps that compatibility bridge in the wire crate instead of letting runtime code parse kind bytes directly.