test: cover every schedule anchor boundary

src/cron/schedule.test.ts

@@ -31,4 +31,13 @@ describe("cron schedule", () => {
     // Should return nowMs + everyMs, not nowMs (which would cause infinite loop)
     expect(next).toBe(now + 30_000);
   });
+
+  it("advances when now matches anchor for every schedule", () => {
+    const anchor = Date.parse("2025-12-13T00:00:00.000Z");
+    const next = computeNextRunAtMs(
+      { kind: "every", everyMs: 30_000, anchorMs: anchor },
+      anchor,
+    );
+    expect(next).toBe(anchor + 30_000);
+  });
 });