v0.4.0 - renamed to EEGauge

EEGauge - new name, same project (formerly "BCI Dataset Cards").

Changed

• Renamed the project to EEGauge. The GitHub repo, the Python package, and the CLI
  command are now eegauge (the old GitHub URL redirects).
• Breaking: the command-line entry point changed from bcicards to eegauge, and
  the import package from bcicards to eegauge. Update any scripts or aliases.

Everything else is unchanged: honest dataset cards for public EEG/BCI datasets,
leakage-aware baselines, chance/significance, per-class metrics, and MOABB + EEGDash
metadata. 26 tests; CI green on Windows/Linux x Python 3.11/3.12. Not medical software.