Agent Skills: using-skillshub

How to install, link, and manage AI-agent skills with the `skillshub` CLI. Use this skill whenever the user wants to install a skill, add or remove a tap, share skills across multiple coding agents, sync `~/.skillshub/`, troubleshoot a missing or broken skill, write a `SKILL.md`, or do anything that touches the `skillshub` command — even when they describe the goal without naming the tool (e.g. "I want this skill in Cursor too", "why doesn't Codex see my skill", "package this folder as a skill").