docs(mcp-server): update tools and usage examples

[masnwilliams]

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[mesa-dot-dev]

Mesa Description

This PR updates the MCP server documentation to introduce powerful new web automation capabilities, centered around the new execute_playwright_code tool.

The documentation now frames the MCP server as a sophisticated web automation tool rather than a simple JavaScript evaluator. The new execute_playwright_code tool is highlighted, which allows for dynamic execution of Playwright and TypeScript code. The documentation also emphasizes key features like automatic video replay generation and resource cleanup.

An example has been added to demonstrate how to use the new tool to navigate to a URL and extract the page title.

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[mesa-dot-dev]

Performed full review of e68644d...0def485

Analysis

1. Expanding from JavaScript evaluation to Playwright-based web automation significantly increases the complexity and attack surface of the MCP server, potentially introducing new security vulnerabilities.

2. The automatic video capture feature could lead to performance and storage issues if not properly constrained, especially under high-volume usage scenarios.

3. Dynamic TypeScript/Playwright execution may create challenges for resource management and stability, particularly with long-running or resource-intensive automation tasks.

4. Moving to comprehensive web automation workflows might complicate error handling and debugging processes for both developers and end-users.

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