feat(cron): add --account flag for multi-account delivery routing (#26284)

* feat(cron): add --account flag for multi-account delivery routing

Add support for explicit delivery account routing in cron jobs across CLI, normalization, delivery planning, and isolated delivery target resolution.

Highlights:
- Add --account <id> to cron add and cron edit
- Add optional delivery.accountId to cron types and delivery plan
- Normalize and trim delivery.accountId in cron create/update normalization
- Prefer explicit accountId over session lastAccountId and bindings fallback
- Thread accountId through isolated cron run delivery resolution
- Preserve cron edit --best-effort-deliver/--no-best-effort-deliver behavior by keeping implicit announce mode
- Expand tests for account passthrough/merge/precedence and CLI account flows

* cron: resolve rebase duplicate accountId fields

---------

Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

src/cli/cron-cli.test.ts

@@ -40,15 +40,21 @@ const { registerCronCli } = await import("./cron-cli.js");
 type CronUpdatePatch = {
   patch?: {
     schedule?: { kind?: string; expr?: string; tz?: string; staggerMs?: number };
-    payload?: { message?: string; model?: string; thinking?: string };
-    delivery?: { mode?: string; channel?: string; to?: string; bestEffort?: boolean };
+    payload?: { kind?: string; message?: string; model?: string; thinking?: string };
+    delivery?: {
+      mode?: string;
+      channel?: string;
+      to?: string;
+      accountId?: string;
+      bestEffort?: boolean;
+    };
   };
 };
 
 type CronAddParams = {
   schedule?: { kind?: string; staggerMs?: number };
   payload?: { model?: string; thinking?: string };
-  delivery?: { mode?: string };
+  delivery?: { mode?: string; accountId?: string };
   deleteAfterRun?: boolean;
   agentId?: string;
   sessionTarget?: string;
@@ -246,6 +252,40 @@ describe("cron cli", () => {
     expect(params?.deleteAfterRun).toBe(false);
   });
 
+  it("includes --account on isolated cron add delivery", async () => {
+    const params = await runCronAddAndGetParams([
+      "--name",
+      "accounted add",
+      "--cron",
+      "* * * * *",
+      "--session",
+      "isolated",
+      "--message",
+      "hello",
+      "--account",
+      "  coordinator  ",
+    ]);
+    expect(params?.delivery?.mode).toBe("announce");
+    expect(params?.delivery?.accountId).toBe("coordinator");
+  });
+
+  it("rejects --account on non-isolated/systemEvent cron add", async () => {
+    await expectCronCommandExit([
+      "cron",
+      "add",
+      "--name",
+      "invalid account add",
+      "--cron",
+      "* * * * *",
+      "--session",
+      "main",
+      "--system-event",
+      "tick",
+      "--account",
+      "coordinator",
+    ]);
+  });
+
   it.each([
     { command: "enable" as const, expectedEnabled: true },
     { command: "disable" as const, expectedEnabled: false },
@@ -354,6 +394,13 @@ describe("cron cli", () => {
     expect(patch?.patch?.delivery?.mode).toBe("none");
   });
 
+  it("updates delivery account without requiring --message on cron edit", async () => {
+    const patch = await runCronEditAndGetPatch(["--account", "  coordinator  "]);
+    expect(patch?.patch?.payload?.kind).toBe("agentTurn");
+    expect(patch?.patch?.delivery?.accountId).toBe("coordinator");
+    expect(patch?.patch?.delivery?.mode).toBeUndefined();
+  });
+
   it("does not include undefined delivery fields when updating message", async () => {
     // Update message without delivery flags - should NOT include undefined delivery fields
     await runCronCommand(["cron", "edit", "job-1", "--message", "Updated message"]);