Refactor: derive version from package.json

src/version.ts

@@ -0,0 +1,7 @@
+import { createRequire } from "node:module";
+
+const require = createRequire(import.meta.url);
+const pkg = require("../package.json") as { version?: string };
+
+// Single source of truth for the current warelay version (reads from package.json).
+export const VERSION = pkg.version ?? "0.0.0";