Fold scattered constants into Tuning

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/Decentralized.Domain/CardLook.cs

@@ -105,7 +105,7 @@ namespace Decentralized.Domain
         public static long Of(string model, double health)
         {
             var spec = Hardware.Specs[model];
-            double f = 0.25 + 0.75 * Math.Max(0, Math.Min(100, health)) / 100.0;
+            double f = Tuning.CardValueFloor + (1 - Tuning.CardValueFloor) * Math.Max(0, Math.Min(100, health)) / 100.0;
             return Math.Max(1, (long)Math.Round(spec.Price * f));
         }