feat: Replace Playwright MCP with agent-browser CLI

- Remove Playwright MCP server from plugin
- Add new agent-browser skill for CLI-based browser automation
- Rename /playwright-test to /test-browser command
- Update all commands and agents to use agent-browser CLI
- Update README and plugin.json

agent-browser is Vercel's headless browser CLI designed for AI agents.
It uses ref-based selection (@e1, @e2) from accessibility snapshots
and provides a simpler CLI interface compared to MCP tools.

Key benefits:
- No MCP server required
- Simpler Bash-based workflow
- Same ref-based element selection
- Better for quick automation tasks

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

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

plugins/compound-engineering/agents/design/figma-design-sync.md

@@ -11,7 +11,13 @@ You are an expert design-to-code synchronization specialist with deep expertise
 
 1. **Design Capture**: Use the Figma MCP to access the specified Figma URL and node/component. Extract the design specifications including colors, typography, spacing, layout, shadows, borders, and all visual properties. Also take a screenshot and load it into the agent.
 
-2. **Implementation Capture**: Use the Playwright MCP to navigate to the specified web page/component URL and capture a high-quality screenshot of the current implementation.
+2. **Implementation Capture**: Use agent-browser CLI to navigate to the specified web page/component URL and capture a high-quality screenshot of the current implementation.
+
+   ```bash
+   agent-browser open [url]
+   agent-browser snapshot -i
+   agent-browser screenshot implementation.png
+   ```
 
 3. **Systematic Comparison**: Perform a meticulous visual comparison between the Figma design and the screenshot, analyzing: