[FEATURE]: Add option to call sub-agents like CC and also being able to call skills

[ashcastelinocs124]

Feature hasn't been suggested before.

• [x] I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

Noticed that whenever I try to call sub-agents in OpenCode it does not show up. I have to turn it into a skill and at times mention the skill name while using it. Why not make that a feature add where the user can call their agents they made.

Also at times OpenCode misses on skills, so having the option to call skill will be a lot easier