Function isGroupID

isGroupID(value: string): value is GroupID
Type guard to check if a string is a valid Political Group ID
Parameters
- value: string
  String to validate
Returns value is GroupID
true if the value matches Group ID format
Example
```
if (isGroupID("EPP")) {
  const id = "EPP" as GroupID;
}
```
- Defined in types/branded.ts:190