feat(FN-4971): add PrInfo regression test

Adds a regression test for the PrInfo endpoint to guard against FN-4971, covering the legacy PR info API path in the dashboard package.

Fusion-Task-Id: FN-4971

packages/dashboard/app/api/__tests__/legacy-prinfo.test.ts

@@ -0,0 +1,35 @@
+import { describe, expect, it } from "vitest";
+import type { PrInfo } from "../legacy";
+
+describe("legacy PrInfo surface", () => {
+  it("supports optional PR automation and draft fields", () => {
+    const info: PrInfo = {
+      url: "https://github.com/org/repo/pull/1",
+      number: 1,
+      status: "open",
+      title: "Add feature",
+      headBranch: "feature-branch",
+      baseBranch: "main",
+      commentCount: 2,
+      isDraft: true,
+      draft: true,
+      autoMergeOnGreen: true,
+      autoMergeStrategy: "squash",
+      lastMergeError: "merge blocked",
+      lastMergeErrorAt: "2026-05-17T12:00:00.000Z",
+      checkRollup: "pending",
+      mergeable: "blocked",
+      lastCommentAt: "2026-05-17T12:01:00.000Z",
+      lastCheckedAt: "2026-05-17T12:02:00.000Z",
+      lastReviewDecision: "REVIEW_REQUIRED",
+    };
+
+    expect(info.draft).toBe(true);
+    expect(info.isDraft).toBe(true);
+    expect(info.autoMergeOnGreen).toBe(true);
+    expect(info.autoMergeStrategy).toBe("squash");
+    expect(info.lastMergeError).toBe("merge blocked");
+    expect(info.lastMergeErrorAt).toBe("2026-05-17T12:00:00.000Z");
+    expect(info.checkRollup).toBe("pending");
+  });
+});