perf: optimize persist delta gating and diagnostics

scripts/build-native-wasm.mjs

@@ -0,0 +1,61 @@
+import { mkdir } from "node:fs/promises";
+import path from "node:path";
+import { spawn } from "node:child_process";
+
+const ROOT = process.cwd();
+const CRATE_DIR = path.resolve(ROOT, "native", "stbme-core");
+const OUT_DIR = path.resolve(ROOT, "vendor", "wasm", "pkg");
+
+function runCommand(command, args, cwd) {
+  return new Promise((resolve, reject) => {
+    const child = spawn(command, args, {
+      cwd,
+      stdio: "inherit",
+      windowsHide: true,
+    });
+
+    child.on("error", reject);
+    child.on("exit", (code, signal) => {
+      if (signal) {
+        reject(new Error(`${command} terminated by signal ${signal}`));
+        return;
+      }
+      if (code !== 0) {
+        reject(new Error(`${command} exited with code ${code}`));
+        return;
+      }
+      resolve();
+    });
+  });
+}
+
+async function main() {
+  await mkdir(OUT_DIR, { recursive: true });
+
+  console.log(`[ST-BME][native] building Rust/WASM from ${CRATE_DIR}`);
+  await runCommand(
+    "wasm-pack",
+    [
+      "build",
+      "--target",
+      "web",
+      "--release",
+      "--out-dir",
+      path.relative(CRATE_DIR, OUT_DIR),
+      "--out-name",
+      "stbme_core_pkg",
+    ],
+    CRATE_DIR,
+  );
+
+  console.log("[ST-BME][native] wasm artifact build completed");
+}
+
+main().catch((error) => {
+  const message = error instanceof Error ? error.message : String(error);
+  console.error("[ST-BME][native] build failed:", message);
+  console.error(
+    "[ST-BME][native] Ensure rustup + wasm32 target + wasm-pack are installed.",
+  );
+  process.exitCode = 1;
+});