sidekick/dreamer agents defined even when disabled

### Short description

sidekick/dreamer agents defined even when disabled

### What happened?

sidekick and dreamer sub-agents are still defined even when enabled=false in magic-context.jsonc

### Diagnostics

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### Plugin version

_No response_

### OpenCode version

_No response_

### Platform

_No response_

### Client

OpenCode Desktop

### Log output (optional)

```shell

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