Add skills resources to Cloudflare API code mode server

[irvinebroque]

Summary

Adds draft MCP Skills extension support to the Cloudflare API Code Mode MCP server.

This assumes Cloudflare Skills are published by developers.cloudflare.com under /.well-known/mcp/skills/, following the artifact shape from cloudflare/cloudflare-docs#31606 and FredKSchott/astro-skills#4.

Related Astro plugin implementation: irvinebroque/astro-skills#1.

Changes

• Advertise capabilities.extensions["io.modelcontextprotocol/skills"] with directoryRead: true
• Serve skill://index.json from the published skills index
• Serve skill://... skill files from published docs artifacts
• Implement resources/directory/read using .tree.json
• Support optional archive resources advertised by index.json
• Register skills only for the default Code Mode server
• Leave codemode=false behavior unchanged

Compatibility

This is additive for MCP clients:

• Existing clients can ignore the new resources and extension capability
• Non-Code Mode MCP server behavior is unchanged
• The server does not depend on GitHub API traversal or raw GitHub file fetches at runtime

Some of the skills.ts adapter code is likely temporary or simplifiable once the Model Context Protocol TypeScript SDK adds native support for the Skills extension and its capability/resource helpers.

Verification

• npm run check

Passed format, lint, typecheck, and all tests.

[mattzcarey]

love this thanks