fix(cli): don't force localhost gateway url in remote mode

Fixes remote gateway setup (remote mode) by not overriding url; adds regression tests. Thanks @oswalpalash.

src/agents/tools/gateway.test.ts

@@ -0,0 +1,31 @@
+import { describe, expect, it, vi } from "vitest";
+
+import { callGatewayTool, resolveGatewayOptions } from "./gateway.js";
+
+const callGatewayMock = vi.fn();
+vi.mock("../../gateway/call.js", () => ({
+  callGateway: (...args: unknown[]) => callGatewayMock(...args),
+}));
+
+describe("gateway tool defaults", () => {
+  it("leaves url undefined so callGateway can use config", () => {
+    const opts = resolveGatewayOptions();
+    expect(opts.url).toBeUndefined();
+  });
+
+  it("passes through explicit overrides", async () => {
+    callGatewayMock.mockResolvedValueOnce({ ok: true });
+    await callGatewayTool(
+      "health",
+      { gatewayUrl: "ws://example", gatewayToken: "t", timeoutMs: 5000 },
+      {},
+    );
+    expect(callGatewayMock).toHaveBeenCalledWith(
+      expect.objectContaining({
+        url: "ws://example",
+        token: "t",
+        timeoutMs: 5000,
+      }),
+    );
+  });
+});