makeRoomCode checked only the in-memory map, which covers every live
and restored room — but a file that failed to restore stays on disk
with no map entry, and a new room taking its code would append a
second game into the orphaned file, corrupting both. The generator
now rerolls on disk presence too.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Eric WagonerandClaude Fable 5
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