fix: land cron tz one-shot handling and prerelease config warnings (#53224) (thanks @RolfHegr)

src/cli/cron-cli.test.ts

@@ -658,6 +658,27 @@ describe("cron cli", () => {
     expect(params.schedule.at).toBe("2026-03-23T21:00:00.000Z");
   });
 
+  it("applies --tz to --at correctly across DST boundaries on cron add", async () => {
+    await runCronCommand([
+      "cron",
+      "add",
+      "--name",
+      "tz-at-dst-test",
+      "--at",
+      "2026-03-29T01:30:00",
+      "--tz",
+      "Europe/Oslo",
+      "--session",
+      "isolated",
+      "--message",
+      "test",
+    ]);
+
+    const params = getGatewayCallParams<{ schedule: { kind: string; at: string } }>("cron.add");
+    expect(params.schedule.kind).toBe("at");
+    expect(params.schedule.at).toBe("2026-03-29T00:30:00.000Z");
+  });
+
   it("sets explicit stagger for cron edit", async () => {
     await runCronCommand(["cron", "edit", "job-1", "--cron", "0 * * * *", "--stagger", "30s"]);
 
@@ -685,6 +706,24 @@ describe("cron cli", () => {
     await expectCronEditWithScheduleLookupExit({ kind: "every", everyMs: 60_000 }, ["--exact"]);
   });
 
+  it("applies --tz to --at for offset-less datetimes on cron edit", async () => {
+    const patch = await runCronEditAndGetPatch([
+      "--at",
+      "2026-03-23T23:00:00",
+      "--tz",
+      "Europe/Oslo",
+    ]);
+
+    expect(patch?.patch?.schedule).toEqual({
+      kind: "at",
+      at: "2026-03-23T22:00:00.000Z",
+    });
+  });
+
+  it("rejects --tz with --every on cron edit", async () => {
+    await expectCronCommandExit(["cron", "edit", "job-1", "--every", "10m", "--tz", "UTC"]);
+  });
+
   it("patches failure alert settings on cron edit", async () => {
     callGatewayFromCli.mockClear();