feat(FN-4168): complete Step 4 — hydrate stalled review signal

Fusion-Task-Id: FN-4168
Fusion-Task-Lineage: 781ffc66-cb1c-42b9-85e1-e5cbe0655863

packages/core/src/__tests__/store-stalled-review.test.ts

@@ -0,0 +1,41 @@
+import { afterEach, beforeEach, describe, expect, it } from "vitest";
+import { mkdtemp, rm } from "node:fs/promises";
+import { join } from "node:path";
+import { tmpdir } from "node:os";
+
+import { TaskStore } from "../store.js";
+
+describe("TaskStore stalledReview hydration", () => {
+  let rootDir: string;
+  let globalDir: string;
+  let store: TaskStore;
+
+  beforeEach(async () => {
+    rootDir = await mkdtemp(join(tmpdir(), "store-stalled-review-"));
+    globalDir = join(rootDir, ".fusion-global-settings");
+    store = new TaskStore(rootDir, globalDir, { inMemoryDb: true });
+    await store.init();
+  });
+
+  afterEach(async () => {
+    await store.close();
+    await rm(rootDir, { recursive: true, force: true });
+  });
+
+  it("populates stalledReview on slim listings when reenqueue churn threshold is met", async () => {
+    const task = await store.createTask({
+      description: "stalled review candidate",
+      column: "in-review",
+    });
+
+    for (let i = 0; i < 3; i += 1) {
+      await store.logEntry(task.id, "Auto-recovered: eligible in-review task re-enqueued for merge");
+    }
+
+    const slimTasks = await store.listTasks({ slim: true, column: "in-review" });
+    const hydrated = slimTasks.find((entry) => entry.id === task.id);
+
+    expect(hydrated?.stalledReview?.heuristic).toBe("reenqueue-churn");
+    expect(hydrated?.stalledReview?.matchCount).toBe(3);
+  });
+});