Function RegisterClassEx

RegisterClassEx(
baseClass: unknown,
options?: RegisterClassOptions,
): (constructor: Function) => void
Decorate your class with this to register it with the MJGlobal class factory using a structured options bag. The Ex suffix follows MJ's existing Foo / FooAsync / FooEx naming convention for "same thing, modern variant."

Prefer this over RegisterClass for new code when you have anything beyond (baseClass, key, priority) to specify. The positional form gets unwieldy past three args and the boolean flags read as anonymous magic.

Same registration semantics as RegisterClass under the hood — pick the shape that reads best at the call site.
Parameters
- baseClass: unknown
  A reference to the base class you are registering a sub-class for
- options: RegisterClassOptions = {}
  Structured options — see RegisterClassOptions. All fields optional.
Returns (constructor: Function) => void
Example: Structured panel registration with metadata
```
@RegisterClassEx(BaseFormPanel, {
    key: 'content-sources:tag-pipeline',
    skipNullKeyWarning: true,
    metadata: {
        entity: 'MJ: Content Sources',
        slot: 'after-fields',
        sortKey: 100,
    },
})
export class TagPipelinePanel extends BaseFormPanel { ... }
```
- Defined in RegisterClass.ts:92