feat: add Chrome extension browser relay

src/cli/browser-cli-extension.test.ts

@@ -0,0 +1,20 @@
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+
+import { describe, expect, it } from "vitest";
+
+describe("browser extension install", () => {
+  it("installs into the state dir (never node_modules)", async () => {
+    const tmp = fs.mkdtempSync(path.join(os.tmpdir(), "clawdbot-ext-"));
+    const { installChromeExtension } = await import("./browser-cli-extension.js");
+
+    const sourceDir = path.resolve(process.cwd(), "assets/chrome-extension");
+    const result = await installChromeExtension({ stateDir: tmp, sourceDir });
+
+    expect(result.path).toBe(path.join(tmp, "browser", "chrome-extension"));
+    expect(fs.existsSync(path.join(result.path, "manifest.json"))).toBe(true);
+    expect(result.path.includes("node_modules")).toBe(false);
+  });
+});
+