feat: add gateway config/update restart flow

src/gateway/server.config-apply.test.ts

@@ -0,0 +1,85 @@
+import fs from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
+import { describe, expect, it, vi } from "vitest";
+
+import {
+  connectOk,
+  installGatewayTestHooks,
+  onceMessage,
+  startServerWithClient,
+} from "./test-helpers.js";
+
+installGatewayTestHooks();
+
+describe("gateway config.apply", () => {
+  it("writes config, stores sentinel, and schedules restart", async () => {
+    vi.useFakeTimers();
+    const sigusr1 = vi.fn();
+    process.on("SIGUSR1", sigusr1);
+
+    const { server, ws } = await startServerWithClient();
+    await connectOk(ws);
+
+    const id = "req-1";
+    ws.send(
+      JSON.stringify({
+        type: "req",
+        id,
+        method: "config.apply",
+        params: {
+          raw: '{ "agent": { "workspace": "~/clawd" } }',
+          sessionKey: "agent:main:whatsapp:dm:+15555550123",
+          restartDelayMs: 0,
+        },
+      }),
+    );
+    const res = await onceMessage<{ ok: boolean; payload?: unknown }>(
+      ws,
+      (o) => o.type === "res" && o.id === id,
+    );
+    expect(res.ok).toBe(true);
+
+    await vi.advanceTimersByTimeAsync(0);
+    expect(sigusr1).toHaveBeenCalled();
+
+    const sentinelPath = path.join(
+      os.homedir(),
+      ".clawdbot",
+      "restart-sentinel.json",
+    );
+    const raw = await fs.readFile(sentinelPath, "utf-8");
+    const parsed = JSON.parse(raw) as { payload?: { kind?: string } };
+    expect(parsed.payload?.kind).toBe("config-apply");
+
+    ws.close();
+    await server.close();
+    process.off("SIGUSR1", sigusr1);
+    vi.useRealTimers();
+  });
+
+  it("rejects invalid raw config", async () => {
+    const { server, ws } = await startServerWithClient();
+    await connectOk(ws);
+
+    const id = "req-2";
+    ws.send(
+      JSON.stringify({
+        type: "req",
+        id,
+        method: "config.apply",
+        params: {
+          raw: "{",
+        },
+      }),
+    );
+    const res = await onceMessage<{ ok: boolean; error?: unknown }>(
+      ws,
+      (o) => o.type === "res" && o.id === id,
+    );
+    expect(res.ok).toBe(false);
+
+    ws.close();
+    await server.close();
+  });
+});