The colibri CLI's parse_args and run handler referenced Command::ListSkills
and Command::RegisterSkill, but both variants were missing from the enum
definition. This caused a build failure on Linux (rustc 1.95.0).
Added the missing variants with their fields (name, description, category
for RegisterSkill). Build + test + format gate verified green.
Co-Authored-By: Hermes Agent <hermes@clawdie.si>