Function encode_session_frame 

pub fn encode_session_frame(
    frame: &SessionFrame,
    seq: u64,
) -> Result<Vec<u8>, FramingError>

Encode one SessionFrame to complete wire bytes ([1][u32 len][prost Frame]), ready to write to a transport.

Errors

FramingError::FrameTooLarge when the encoded envelope exceeds the frame cap — propagated from encode_framed.