Review user feedback and logging

- [ ] Review logger and exception handling, consider `loguru` for more feature complete logging and `better_exceptions` for more informative errors
- [ ] Review handling of pydantic errors, to ensure they are clear and readable

No files, tests, or entry points are named. Start by reviewing the logger and exception-handling paths, then inspect how pydantic errors are handled; the work is done when the logging and error-message changes have a defined scope and produce clear, readable failures.

Written by the indexing model from the issue text.