refactor: cron payload migration cleanup (#621)

* refactor: centralize cron payload migration

* test: stabilize block streaming mocks

* test: adjust chunker fence-close case

src/cron/service.test.ts

@@ -136,7 +136,7 @@ describe("CronService", () => {
         kind: "agentTurn",
         message: "hi",
         deliver: true,
-        channel: "telegram",
+        channel: " TeLeGrAm ",
         to: "7200373102",
       },
       state: {},
@@ -169,6 +169,56 @@ describe("CronService", () => {
     await store.cleanup();
   });
 
+  it("canonicalizes payload.provider casing on load", async () => {
+    const store = await makeStorePath();
+    const enqueueSystemEvent = vi.fn();
+    const requestHeartbeatNow = vi.fn();
+
+    const rawJob = {
+      id: "legacy-2",
+      name: "legacy",
+      enabled: true,
+      createdAtMs: Date.now(),
+      updatedAtMs: Date.now(),
+      schedule: { kind: "cron", expr: "* * * * *" },
+      sessionTarget: "isolated",
+      wakeMode: "now",
+      payload: {
+        kind: "agentTurn",
+        message: "hi",
+        deliver: true,
+        provider: "Telegram",
+        to: "7200373102",
+      },
+      state: {},
+    };
+
+    await fs.mkdir(path.dirname(store.storePath), { recursive: true });
+    await fs.writeFile(
+      store.storePath,
+      JSON.stringify({ version: 1, jobs: [rawJob] }, null, 2),
+      "utf-8",
+    );
+
+    const cron = new CronService({
+      storePath: store.storePath,
+      cronEnabled: true,
+      log: noopLogger,
+      enqueueSystemEvent,
+      requestHeartbeatNow,
+      runIsolatedAgentJob: vi.fn(async () => ({ status: "ok" })),
+    });
+
+    await cron.start();
+    const jobs = await cron.list({ includeDisabled: true });
+    const job = jobs.find((j) => j.id === rawJob.id);
+    const payload = job?.payload as unknown as Record<string, unknown>;
+    expect(payload.provider).toBe("telegram");
+
+    cron.stop();
+    await store.cleanup();
+  });
+
   it("posts last output to main even when isolated job errors", async () => {
     const store = await makeStorePath();
     const enqueueSystemEvent = vi.fn();