Worked on improving the reliability of the Tesla Fleet API integration within the NoRi2909/core repository, focusing on configuration management and testing. Addressed a critical issue by updating the private key path resolution, ensuring the key is loaded from hass.config.path('tesla_fleet.key') to maintain compatibility across different environments. Enhanced the unit tests to align with the corrected configuration path, which increased test coverage and reduced the risk of regression. Utilized Python and Home Assistant integration skills to remove a configuration-path related failure mode, resulting in fewer runtime errors and greater stability for the Tesla Fleet integration during deployment and operation.