Register the actual config file path for a component.
Parameters
componentName: string
The component name (e.g., 'watcher', 'runner').
absolutePath: string
Absolute path to the component's config file.
Returns void
Remarks
Call this after resolving the --config CLI argument so that
getComponentConfigPath returns the real file location instead of
the default derived from configRoot.
Register the actual config file path for a component.