Summary

• let cron jobs inherit the runtime provider configured in config.yaml when the job omits provider
• preserve config model.base_url for custom providers unless the job overrides it
• add a regression test covering config runtime inheritance over env overrides

Testing

• pytest -o addopts='' tests/cron/test_scheduler.py -k "config_runtime_over_env_override or bad_config_yaml_is_logged or bad_prefill_messages_is_logged"