chore: import upstream snapshot with attribution

scripts/postinstall.mjs

@@ -0,0 +1,27 @@
+#!/usr/bin/env node
+/**
+ * Post-install warm-up for OmniRoute native runtimes.
+ *
+ * Runs after the main `scripts/build/postinstall.mjs` binary-copy step.
+ * Tries to pre-resolve better-sqlite3 into ~/.omniroute/runtime/ so that
+ * the first execution is fast and EBUSY-resilient on Windows.
+ *
+ * Non-fatal: any error is printed as a warning and install continues.
+ */
+
+if (
+  process.env.OMNIROUTE_SKIP_POSTINSTALL === "1" ||
+  process.env.CI === "true" ||
+  process.env.CI === "1"
+) {
+  process.exit(0);
+}
+
+(async () => {
+  try {
+    const { warmUpRuntimes } = await import("../bin/cli/runtime/index.mjs");
+    await warmUpRuntimes();
+  } catch (err) {
+    console.warn(`[omniroute] postinstall warm-up skipped: ${err?.message ?? err}`);
+  }
+})();