Function isMEPID

isMEPID(value: string): value is MEPID
Type guard to check if a string is a valid MEP ID
Parameters
- value: string
  String to validate
Returns value is MEPID
true if the value matches MEP ID format (numeric string)
Example
```
if (isMEPID("124936")) {
  const id = "124936" as MEPID;
}
```
- Defined in types/branded.ts:118