test: add Kimi and Qianfan extension coverage

extensions/kimi-coding/replay-policy.test.ts

@@ -0,0 +1,10 @@
+import { describe, expect, it } from "vitest";
+import { KIMI_REPLAY_POLICY } from "./replay-policy.js";
+
+describe("kimi replay policy", () => {
+  it("disables signature preservation for replay repair", () => {
+    expect(KIMI_REPLAY_POLICY).toEqual({
+      preserveSignatures: false,
+    });
+  });
+});