fix(coding-agent): split /clone from /fork UX

closes #2962

packages/coding-agent/test/rpc-client-clone.test.ts

@@ -0,0 +1,29 @@
+import { describe, expect, it, vi } from "vitest";
+import { RpcClient } from "../src/modes/rpc/rpc-client.js";
+
+type RpcClientPrivate = {
+	send: (command: { type: string }) => Promise<unknown>;
+	getData: <T>(response: unknown) => T;
+};
+
+describe("RpcClient clone", () => {
+	it("sends the clone RPC command", async () => {
+		const client = new RpcClient();
+		const privateClient = client as unknown as RpcClientPrivate;
+		const send = vi.fn(async () => ({
+			type: "response",
+			command: "clone",
+			success: true,
+			data: { cancelled: false },
+		}));
+		privateClient.send = send;
+		privateClient.getData = <T>(response: unknown): T => {
+			return (response as { data: T }).data;
+		};
+
+		const result = await client.clone();
+
+		expect(send).toHaveBeenCalledWith({ type: "clone" });
+		expect(result).toEqual({ cancelled: false });
+	});
+});