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`.