FEnigma contains the whole word "enigma" while still opening on Fe (iron),
matching IRON NEST; FeNigma only contained "nigma". The cost is that iron's
symbol is Fe, not FE.
Code paths are untouched: the Python package stays lowercase `fenigma`, and
the git remote URL is unchanged since the repository itself has not been
renamed. APP_ID moved too, which is safe -- it is only the GTK application
id, with no saved state derived from it.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>