MCP Hub v0.2.0

Changelog

• 69cac74 ♻️ refactor: move CLI flags from global to command-level
• 74728f6 ✅ test(skills): add unit tests for git backend and installer
• df44648 ✨ feat(skills): add CLI support for all source types
• cbdfd5a ✨ feat(skills): add HTTP provider interface and registry
• ca9e13a ✨ feat(skills): add HTTP providers (Direct, Mintlify, HuggingFace)
• 3e4587c ✨ feat(skills): add git backend using go-git and installer
• 58ec689 ✨ feat(skills): add source parser and core skill types
• cd76794 ✨ feat(skills): add well-known skills discovery (RFC 8615)
• 8adca13 🐛 fix(skills): restore owner/repo cache directory structure
• 25bff51 📝 docs: update changelog for v0.2.0