Channels: move single-account config into accounts.default (#27334)

Merged via /review-pr -> /prepare-pr -> /merge-pr.

Prepared head SHA: 50b5771808
Co-authored-by: gumadeiras <5599352+gumadeiras@users.noreply.github.com>
Co-authored-by: gumadeiras <5599352+gumadeiras@users.noreply.github.com>
Reviewed-by: @gumadeiras

src/commands/doctor-config-flow.missing-default-account-bindings.integration.test.ts

@@ -0,0 +1,56 @@
+import { describe, expect, it, vi } from "vitest";
+import { withEnvAsync } from "../test-utils/env.js";
+import { runDoctorConfigWithInput } from "./doctor-config-flow.test-utils.js";
+
+const { noteSpy } = vi.hoisted(() => ({
+  noteSpy: vi.fn(),
+}));
+
+vi.mock("../terminal/note.js", () => ({
+  note: noteSpy,
+}));
+
+vi.mock("./doctor-legacy-config.js", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("./doctor-legacy-config.js")>();
+  return {
+    ...actual,
+    normalizeLegacyConfigValues: (cfg: unknown) => ({
+      config: cfg,
+      changes: [],
+    }),
+  };
+});
+
+import { loadAndMaybeMigrateDoctorConfig } from "./doctor-config-flow.js";
+
+describe("doctor missing default account binding warning", () => {
+  it("emits a doctor warning when named accounts have no valid account-scoped bindings", async () => {
+    await withEnvAsync(
+      {
+        TELEGRAM_BOT_TOKEN: undefined,
+        TELEGRAM_BOT_TOKEN_FILE: undefined,
+      },
+      async () => {
+        await runDoctorConfigWithInput({
+          config: {
+            channels: {
+              telegram: {
+                accounts: {
+                  alerts: {},
+                  work: {},
+                },
+              },
+            },
+            bindings: [{ agentId: "ops", match: { channel: "telegram" } }],
+          },
+          run: loadAndMaybeMigrateDoctorConfig,
+        });
+      },
+    );
+
+    expect(noteSpy).toHaveBeenCalledWith(
+      expect.stringContaining("channels.telegram: accounts.default is missing"),
+      "Doctor warnings",
+    );
+  });
+});