Add setup-macos.sh, a shell script that automates Claude Desktop MCP
configuration on macOS. The script detects KiCad's bundled Python,
resolves PYTHONPATH, generates the correct MCP server config, and
safely merges it into the existing Claude Desktop configuration with
backup support. Supports --verify, --dry-run, and --apply modes.
Update README.md with documentation for the automated setup workflow,
including usage examples, parameter reference, and post-setup steps.
Extend docs/PLATFORM_GUIDE.md with macOS-specific sections covering
installation, path handling, Python environment, troubleshooting,
best practices, cross-platform migration, and support resources.
Update docs/STATUS_SUMMARY.md to reflect the new macOS automation
capabilities and bump the last-updated date.
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