Skill import from URL/git

[devrimcavusoglu]

Context

A generic GitHub URL importer would allow importing skills from remote sources (GitHub URL, gist, git repo). The Agent Skills spec is file-based, making this straightforward — download the SKILL.md + companion files into the registry.

Proposed Changes

• Add skern skill import <url> command
• Support GitHub repository URLs, gists, and raw file URLs
• Download SKILL.md + companion files into the local registry

Related

This largely overlaps with #19 (incorporating awesome-agent-skills as a reference catalog). Both features involve fetching skills from remote sources.

References

Analysis item 2.3