Massive Internal Refactoring: Native Node.js Modules

The most significant internal change in this release is a wholesale migration from bundled polyfills and custom wrappers to native Node.js built-in modules:

• Removed bundled libraries: WebSocket (ws client/server), undici HTTP client, Fetch API polyfill, URL/URLSearchParams polyfill, YAML parser, FormData implementation, Bidirectional Text Algorithm, HTTP/1.1 and HTTP/2 protocol handlers
• Replaced with: Direct require() calls to Node.js built-ins (fs, fs/promises, path, crypto, os, url, http, http2, stream, child_process, net, events, buffer, util, vm, module)
• Custom file system wrappers removed: The 40+ method kv5 filesystem abstraction layer was removed in favor of direct fs and fs/promises calls throughout the codebase
• Over 100 scattered module imports were consolidated into centralized initialization blocks
• Custom UUID generation replaced with crypto.randomUUID() across dozens of call sites
• Custom path utilities replaced with path.join(), path.resolve(), path.basename(), etc.

This results in a smaller bundle size and better alignment with the Node.js runtime.