[2.1.0] Add Playwright MCP server and replace Puppeteer references

- Bundle @playwright/mcp for browser automation across all plugin users
- Replace all Puppeteer references with Playwright in agents and commands:
  - bug-reproduction-validator
  - design-iterator
  - design-implementation-reviewer
  - figma-design-sync
  - generate_command
- Document Playwright tools: browser_navigate, browser_take_screenshot,
  browser_click, browser_fill_form, browser_snapshot, browser_evaluate

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

plugins/compounding-engineering/README.md

@@ -9,6 +9,7 @@ AI-powered development tools that get smarter with every use. Make each unit of
 | Agents | 24 |
 | Commands | 15 |
 | Skills | 11 |
+| MCP Servers | 1 |
 
 ## Agents
 
@@ -130,6 +131,22 @@ Access via `/workflows:command`:
 - `GEMINI_API_KEY` environment variable
 - Python packages: `google-genai`, `pillow`
 
+## MCP Servers
+
+| Server | Description |
+|--------|-------------|
+| `playwright` | Browser automation via `@playwright/mcp` |
+
+**Playwright tools provided:**
+- `browser_navigate` - Navigate to URLs
+- `browser_take_screenshot` - Take screenshots
+- `browser_click` - Click elements
+- `browser_fill_form` - Fill form fields
+- `browser_snapshot` - Get accessibility snapshot
+- `browser_evaluate` - Execute JavaScript
+
+MCP servers start automatically when the plugin is enabled.
+
 ## Installation
 
 ```bash