Base implementation that loads configuration, handling Config1 to Config2 migration.
This method: - Initializes Config1 and Config2 static properties - Sets config paths - Loads Config2 if it exists - Migrates Config1 to Config2 if needed - Returns loaded or default Config2 instance
Implementations should call this from their `load_config()` method after performing any necessary type registration.
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The loaded Config2 instance |