fix RingBuffer naming 'final'

engine/lib/RingBuffer.test.ts

@@ -1,12 +1,12 @@
 import { expect, test } from "vitest";
-import { claim, createRingBuffer } from "./RingBuffer.ts";
+import { claim, createRingBuffer, type RingBuffer } from "./RingBuffer.ts";
 
 test("RingBuffer", () => {
 	expect(() => createRingBuffer(3, () => ({}))).toThrow(
 		"size must be a power of two",
 	);
 
-	const ring = createRingBuffer(4, () => ({}));
+	const ring: RingBuffer<object> = createRingBuffer(4, () => ({}));
 
 	expect(ring.size).toBe(4);
 	expect(ring.cursor).toBe(0);