feat: add Signal provider support

src/commands/send.test.ts

@@ -35,6 +35,7 @@ const makeDeps = (overrides: Partial<CliDeps> = {}): CliDeps => ({
   sendMessageWhatsApp: vi.fn(),
   sendMessageTelegram: vi.fn(),
   sendMessageDiscord: vi.fn(),
+  sendMessageSignal: vi.fn(),
   ...overrides,
 });
 
@@ -106,6 +107,23 @@ describe("sendCommand", () => {
     expect(deps.sendMessageWhatsApp).not.toHaveBeenCalled();
   });
 
+  it("routes to signal provider", async () => {
+    const deps = makeDeps({
+      sendMessageSignal: vi.fn().mockResolvedValue({ messageId: "s1" }),
+    });
+    await sendCommand(
+      { to: "+15551234567", message: "hi", provider: "signal" },
+      deps,
+      runtime,
+    );
+    expect(deps.sendMessageSignal).toHaveBeenCalledWith(
+      "+15551234567",
+      "hi",
+      expect.objectContaining({ mediaUrl: undefined }),
+    );
+    expect(deps.sendMessageWhatsApp).not.toHaveBeenCalled();
+  });
+
   it("emits json output", async () => {
     callGatewayMock.mockResolvedValueOnce({ messageId: "direct2" });
     const deps = makeDeps();