[Bug] Skill call used hook not triggered for command execution

Question

**Bug Description**
Currently running a command (i.e., /my-skill-name) doesn't trigger a skill call used hook.  When trying to make integrations that rely on skills being used (such as reporting skill use metrics in my case) this inconsistency makes it so we miss a fairly large swath of skill usage.  The current implementation feels very inconsistent since the skill is being used when the /command is used but it's not triggering the hook.

**Environment Info**
- Platform: darwin
- Terminal: ghos