chore: checkpoint before Python removal

vendor/zerocopy/benches/try_transmute.rs

@@ -0,0 +1,16 @@
+use zerocopy::Unalign;
+use zerocopy_derive::*;
+
+#[path = "formats/coco_static_size.rs"]
+mod format;
+
+#[derive(IntoBytes, KnownLayout, Immutable)]
+#[repr(C)]
+struct MinimalViableSource {
+    bytes: [u8; 6],
+}
+
+#[unsafe(no_mangle)]
+fn bench_try_transmute(source: MinimalViableSource) -> Option<Unalign<format::CocoPacket>> {
+    zerocopy::try_transmute!(source).ok()
+}