Add @microsoft/atlas-mcp package - MCP server for AI agents

[wibjorn]

Introduces a Model Context Protocol server that exposes Atlas Design System resources to AI agents and copilots (GitHub Copilot, Claude, etc.).

Features:

• 6 tools: search_classes, get_component, get_code_examples, list_components, list_atomics, get_class_details
• 3 resources: atlas://components, atlas://atomics, atlas://tokens
• Bundles 1200+ CSS classes, 40 components, design tokens at build time
• Self-contained npm package - works via npx @microsoft/atlas-mcp

Link: preview

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🦋 Changeset detected

Latest commit: f883201

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

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@microsoft/atlas-mcp	Minor

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