Feature hasn't been suggested before.

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

Describe the enhancement you want to request

I want to provide global agent configuration, global commands - e.g. /etc/opencode/agent/xx.md and /etc/opencode/commands/xx.md - all which can be configured in ~/.config/opencode/ as a predefined value (for all team members).

So opencode should search all configuration data in /etc/opencode and ~/.config/opencode/.

In my opinion, the global must have the highest priority without it being able to be overwritten.

But maybe it would be even better if it can be forced that the global or user/project has priority and can not be overwritten or if it should get merged (json) in which direction.