riparion/riparion-retro

• Add Hammurabi: the 1968/1978 BASIC city-state classic

  #1 in Riparion/riparion-retro — merged 2026-06-07

• Add Fur Trader: the 1976 BASIC fur-trading classic

  #2 in Riparion/riparion-retro — merged 2026-06-07