feat(serializer): add aot serializer

serializer/plugin/symbol.ts

@@ -0,0 +1,10 @@
+/**
+ * The well-known symbol carrying a schema descriptor on a constructor.
+ *
+ * Registered via `Symbol.for` so multiple module copies (workers, dual builds)
+ * share identity.
+ */
+declare const SerializableBrand: unique symbol;
+
+export const Serializable = Symbol.for('@perf/serializable') as typeof SerializableBrand;
+export type SerializableKey = typeof SerializableBrand;