Derive Macro FrameWrite 

#[derive(FrameWrite)]
{
    // Attributes available to this derive:
    #[frame]
}

Derives ace_core::codec::FrameWrite for a struct or enum.

Generates both encode paths gated by the alloc feature:

• #[cfg(not(feature = "alloc"))] - writes into &mut &mut [u8] cursor
• #[cfg(feature = "alloc")] - appends into bytes::BytesMut

All non-skipped fields are encoded in declaration order by delegating to each field type’s FrameWrite impl. #[frame(length = "...")] and #[frame(read_all)] are decode-only hints and have no effect on encode.

Supports the same container, field, and variant attributes as FrameRead.