ContextualLogger methods forwarded all **kwargs as extra={} to Python's
standard logger. When callers passed exc_info=True, it landed in the
extra dict and Python's LogRecord raised KeyError("Attempt to overwrite
'exc_info' in LogRecord") since exc_info is a reserved attribute.
This caused /submit-scorecard to crash after game data was already
posted, masking the original error and preventing proper rollback.
Fix: Extract exc_info and stack_info from kwargs before passing as extra,
forwarding them as proper logging parameters instead. Also fix direct
callers in submit_scorecard.py and views/players.py to use error=e.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
313c3f857b