release: run the version sync script in the changesets action

.github/workflows/release.yml

@@ -23,7 +23,7 @@ jobs:
       # the vX.Y.Z tag — and the tag triggers the GoReleaser workflow.
       - uses: changesets/action@v1
         with:
-          version: npx changeset version
+          version: npm run version # changeset version + sync rust/Cargo.toml (lockstep)
           publish: npm run release
         env:
           # A PAT (contents:write + pull-requests:write on this repo) lets the

rust/src/lib.rs

@@ -139,6 +139,16 @@ pub mod prelude {
 #[macro_export]
 macro_rules! shellcade_game {
     ($game:expr) => {
+        // Native builds (cargo test) have no exports, so the registration is
+        // surfaced as a doc-hidden pub fn instead: it type-checks the Game
+        // impl, roots the whole game for dead-code analysis, and hands tests
+        // a constructor.
+        #[cfg(not(target_arch = "wasm32"))]
+        #[doc(hidden)]
+        pub fn __shellcade_game() -> impl $crate::Game {
+            $game
+        }
+
         #[cfg(target_arch = "wasm32")]
         const _: () = {
             ::std::thread_local! {