[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/agents/workflow/bug-reproduction-validator.md

@@ -19,7 +19,7 @@ When presented with a bug report, you will:
    - Set up the minimal test case needed to reproduce the issue
    - Execute the reproduction steps methodically, documenting each step
    - If the bug involves data states, check fixtures or create appropriate test data
-   - For UI bugs, consider using Puppeteer MCP if available to visually verify
+   - For UI bugs, consider using Playwright MCP if available to visually verify
    - For backend bugs, examine logs, database states, and service interactions
 
 3. **Validation Methodology**: