feat(cli): add initial CLI implementation with argument parsing and prompt handling

- Created package.json and package-lock.json for CLI package.
- Implemented argument parsing in args.ts to handle various flags and commands.
- Developed main CLI logic in cli.ts to execute commands and handle errors.
- Added configuration loading from a JSON file in config.ts, with environment variable support.
- Implemented prompt resolution and provider interaction in prompt.ts.
- Added usage documentation for the CLI.
- Configured TypeScript settings in tsconfig.json for the CLI package.
- Updated README in vscode package to reflect the new CLI functionality.
- Refactored root tsconfig.json to streamline project structure.

packages/chrome/README.md

@@ -0,0 +1,49 @@
+# LexAI for Chrome
+
+Grammarly-like **Manifest V3** writing assistant powered by **your own LLM API key**. No LexAI account, no subscription, no LexAI servers.
+
+**Chrome Web Store:** [LexAI — AI Writing Assistant](https://chromewebstore.google.com/detail/bagpcheidbkfgijnnmolnkgagibbjfnk)
+
+## Features
+
+- Select text on any page → **Fix / Rephrase / Shorten / Expand / Explain / Make Prompt**
+- Writing styles: Formal, Casual, Academic, Creative, Concise
+- Floating toolbar + right-click context menu + popup editor
+- Prompt Builder (patterns, persona, format)
+- Providers: OpenAI · Anthropic · Groq · OpenRouter
+- API key encrypted locally (`tweetnacl` secretbox)
+
+## Develop
+
+From the **repo root**:
+
+```bash
+npm run chrome:install
+npm run chrome:dev      # hot reload
+npm run chrome:build    # → packages/chrome/.output/chrome-mv3/
+npm run chrome:zip      # store package
+npm run chrome:test
+npm run chrome:typecheck
+```
+
+Or inside this package:
+
+```bash
+npm install
+npm run dev
+npm run build
+```
+
+### Load unpacked
+
+1. `npm run chrome:build`
+2. Chrome → `chrome://extensions` → Developer Mode
+3. **Load unpacked** → select `packages/chrome/.output/chrome-mv3`
+
+## Shared core
+
+Provider adapters and prompts live in [`../../src/lib`](../../src/lib) (`@lib/*`). Do not import `@lib/crypto` or `@lib/messaging` from the VS Code or CLI packages.
+
+## Version
+
+Bump `version` in this package’s `package.json` only — the extension manifest follows it via `wxt.config.ts`.

packages/chrome/package.json

@@ -0,0 +1,35 @@
+{
+  "name": "lexai-chrome",
+  "version": "1.1.0",
+  "description": "LexAI Chrome extension (Manifest V3) — BYO-LLM writing assistant",
+  "private": true,
+  "type": "module",
+  "engines": {
+    "node": ">=22"
+  },
+  "scripts": {
+    "dev": "wxt",
+    "build": "wxt build",
+    "zip": "wxt zip",
+    "postinstall": "wxt prepare",
+    "typecheck": "tsc --noEmit && tsc --noEmit -p tsconfig.test.json",
+    "test": "vitest",
+    "test:e2e": "playwright test"
+  },
+  "dependencies": {
+    "@wxt-dev/module-react": "^1.1.5",
+    "react": "^18.3.1",
+    "react-dom": "^18.3.1",
+    "tweetnacl": "^1.0.3",
+    "wxt": "^0.20.18"
+  },
+  "devDependencies": {
+    "@playwright/test": "^1.50.1",
+    "@types/chrome": "^0.1.37",
+    "@types/react": "^18.3.1",
+    "@types/react-dom": "^18.3.1",
+    "jsdom": "^28.1.0",
+    "typescript": "^5.7.3",
+    "vitest": "^3.0.7"
+  }
+}

packages/chrome/playwright.config.ts

@@ -0,0 +1,23 @@
+import { defineConfig } from '@playwright/test';
+
+export default defineConfig({
+  testDir: '../../tests/e2e',
+  timeout: 30000,
+  use: {
+    channel: 'chrome',
+  },
+  projects: [
+    {
+      name: 'chromium-extension',
+      use: {
+        browserName: 'chromium',
+        launchOptions: {
+          args: [
+            '--disable-extensions-except=.output/chrome-mv3',
+            '--load-extension=.output/chrome-mv3',
+          ],
+        },
+      },
+    },
+  ],
+});

packages/chrome/tsconfig.json

@@ -0,0 +1,28 @@
+{
+  "compilerOptions": {
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "lib": ["ESNext", "DOM"],
+    "jsx": "react-jsx",
+    "strict": true,
+    "noEmit": true,
+    "skipLibCheck": true,
+    "types": ["chrome"],
+    "esModuleInterop": true,
+    "resolveJsonModule": true,
+    "allowImportingTsExtensions": true,
+    "paths": {
+      "@lib/*": ["../../src/lib/*"]
+    }
+  },
+  "include": [
+    "entrypoints/**/*",
+    "../../src/lib/**/*",
+    ".wxt/types/**/*"
+  ],
+  "exclude": [
+    "node_modules",
+    ".output"
+  ]
+}

packages/chrome/tsconfig.test.json

@@ -0,0 +1,10 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "types": ["chrome", "vitest/globals"]
+  },
+  "include": [
+    "../../tests/**/*",
+    "../../src/lib/**/*"
+  ]
+}

packages/chrome/vitest.config.ts

@@ -0,0 +1,17 @@
+import { fileURLToPath } from 'node:url';
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  resolve: {
+    alias: {
+      '@lib': fileURLToPath(new URL('../../src/lib', import.meta.url)),
+    },
+  },
+  test: {
+    environment: 'jsdom',
+    globals: true,
+    setupFiles: ['../../tests/unit/setup.ts'],
+    include: ['../../tests/unit/**/*.test.ts'],
+    exclude: ['../../tests/e2e/**/*'],
+  },
+});

packages/chrome/wxt.config.ts

@@ -5,16 +5,15 @@ import pkg from './package.json';
 export default defineConfig({
   extensionApi: 'chrome',
   // Shared-code alias. Deliberately NOT "~" or "@" — WXT force-overwrites those
-  // to srcDir (the project root here), so they cannot point at ./src.
+  // to srcDir, so they cannot point at the monorepo shared lib.
   alias: {
-    '@lib': resolve(__dirname, 'src/lib'),
+    '@lib': resolve(__dirname, '../../src/lib'),
   },
   modules: ['@wxt-dev/module-react'],
   manifest: {
     name: 'LexAI - AI Writing Assistant',
     description: 'Grammar checking and writing assistance powered by your own LLM API key',
-    // Single source of truth: manifest version always follows package.json,
-    // so a release bump is a one-file edit and versions can never drift.
+    // Single source of truth: manifest version always follows package.json.
     version: pkg.version,
     icons: {
       '16': 'icon-16.png',