feat: centralize application framework primitives

packages/cli/src/write-generated.ts

@@ -0,0 +1,11 @@
+import { existsSync, readFileSync, writeFileSync } from "node:fs";
+
+/** Write generated UTF-8 output only when bytes changed, preserving mtimes on no-op builds. */
+export function writeGeneratedFile(path: string, content: string): boolean {
+  const normalized = content.replace(/\r\n/g, "\n");
+  if (existsSync(path) && readFileSync(path, "utf8").replace(/\r\n/g, "\n") === normalized) {
+    return false;
+  }
+  writeFileSync(path, normalized, "utf8");
+  return true;
+}