Outbound: scope core send media roots by agent (#17268)

Merged with gates skipped by maintainer request.

Prepared head SHA: 663ac49b3a

src/infra/outbound/message.test.ts

@@ -0,0 +1,54 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+
+const mocks = vi.hoisted(() => ({
+  getChannelPlugin: vi.fn(),
+  resolveOutboundTarget: vi.fn(),
+  deliverOutboundPayloads: vi.fn(),
+}));
+
+vi.mock("../../channels/plugins/index.js", () => ({
+  normalizeChannelId: (channel?: string) => channel?.trim().toLowerCase() ?? undefined,
+  getChannelPlugin: mocks.getChannelPlugin,
+}));
+
+vi.mock("./targets.js", () => ({
+  resolveOutboundTarget: mocks.resolveOutboundTarget,
+}));
+
+vi.mock("./deliver.js", () => ({
+  deliverOutboundPayloads: mocks.deliverOutboundPayloads,
+}));
+
+import { sendMessage } from "./message.js";
+
+describe("sendMessage", () => {
+  beforeEach(() => {
+    mocks.getChannelPlugin.mockReset();
+    mocks.resolveOutboundTarget.mockReset();
+    mocks.deliverOutboundPayloads.mockReset();
+
+    mocks.getChannelPlugin.mockReturnValue({
+      outbound: { deliveryMode: "direct" },
+    });
+    mocks.resolveOutboundTarget.mockImplementation(({ to }: { to: string }) => ({ ok: true, to }));
+    mocks.deliverOutboundPayloads.mockResolvedValue([{ channel: "mattermost", messageId: "m1" }]);
+  });
+
+  it("passes explicit agentId to outbound delivery for scoped media roots", async () => {
+    await sendMessage({
+      cfg: {},
+      channel: "mattermost",
+      to: "channel:town-square",
+      content: "hi",
+      agentId: "work",
+    });
+
+    expect(mocks.deliverOutboundPayloads).toHaveBeenCalledWith(
+      expect.objectContaining({
+        agentId: "work",
+        channel: "mattermost",
+        to: "channel:town-square",
+      }),
+    );
+  });
+});