Function loadEntityConfig

loadEntityConfig(dir: string): Promise<EntityConfig>
Load entity-specific configuration from a directory

Loads .mj-sync.json file that contains an "entity" field, indicating this directory contains data for a specific entity type. Returns null if the file doesn't exist or doesn't contain an entity field.
Parameters
- dir: string
  Directory path to load configuration from
Returns Promise<EntityConfig>
Promise resolving to EntityConfig if found and valid, null otherwise
Example
```
const entityConfig = await loadEntityConfig('./ai-prompts');
if (entityConfig) {
  console.log(`Directory contains ${entityConfig.entity} records`);
}
```
- Defined in packages/MetadataSync/src/config.ts:384