fix(console): normalize Windows artisan path

[soleinjast]

Summary

On Windows, running mcp:inspector produced guidance output with backslashes and relied on getcwd() to resolve artisan.
This caused confusing or incorrect paths in some setups.

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Changes

• Resolve the artisan entrypoint via base_path('artisan') instead of getcwd().
• Normalize Windows paths to forward slashes for guidance output only.
• Keep the raw resolved path for Symfony Process execution.
• Added tests for Windows-style, mixed, and Unix paths.
• Retained existing validation for invalid handles and missing arguments.

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Benefit

Improves cross-platform consistency and clarity of console output without breaking existing functionality.

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Before (Windows)

Arguments => D:\Herd\cyborgfinance\artisan mcp:start demo

After (Windows)

Arguments => D:/Herd/cyborgfinance/artisan mcp:start demo