feat(ci): ensure wasm-stdlib.h is regenerated when wasm stdlib source

files are modified.

.github/scripts/wasm_stdlib.js

@@ -0,0 +1,25 @@
+module.exports = async ({ github, context, core }) => {
+  if (context.eventName !== 'pull_request') return;
+
+  const prNumber = context.payload.pull_request.number;
+  const owner = context.repo.owner;
+  const repo = context.repo.repo;
+
+  const { data: files } = await github.rest.pulls.listFiles({
+    owner,
+    repo,
+    pull_number: prNumber
+  });
+
+  const changedFiles = files.map(file => file.filename);
+
+  const wasmStdLibSrc = 'crates/language/wasm/';
+  const dirChanged = changedFiles.some(file => file.startsWith(wasmStdLibSrc));
+
+  if (!dirChanged) return;
+
+  const wasmStdLibHeader = 'lib/src/wasm/wasm-stdlib.h';
+  const requiredChanged = changedFiles.includes(wasmStdLibHeader);
+
+  if (!requiredChanged) core.setFailed(`Changes detected in ${wasmStdLibSrc} but ${wasmStdLibHeader} was not modified.`);
+};