chore: import upstream snapshot with attribution

apps/webapp/app/v3/mollifier/mollifierSnapshot.server.ts

@@ -0,0 +1,16 @@
+import { serialiseSnapshot, deserialiseSnapshot } from "@trigger.dev/redis-worker";
+
+// MollifierSnapshot is the JSON-serialisable shape of the input that would be
+// passed to engine.trigger(). The drainer deserialises and replays it.
+// Kept as Record<string, unknown> at this layer — the engine.trigger call site
+// casts it to the engine's typed input. This keeps the mollifier subdirectory
+// from depending on @internal/run-engine internals.
+export type MollifierSnapshot = Record<string, unknown>;
+
+export function serialiseMollifierSnapshot(input: MollifierSnapshot): string {
+  return serialiseSnapshot(input);
+}
+
+export function deserialiseMollifierSnapshot(serialised: string): MollifierSnapshot {
+  return deserialiseSnapshot<MollifierSnapshot>(serialised);
+}