Function createMEPID

createMEPID(value: string): MEPID
Factory function to create a validated MEP ID
Parameters
- value: string
  String to convert to MEP ID
Returns MEPID
Branded MEP ID
Throws
If value is not a valid MEP ID format
Example
```
const mepId = createMEPID("124936");
const details = await getMEPDetails(mepId);
```
Security
Input validation prevents injection attacks
- Defined in types/branded.ts:213