Fold scattered constants into Tuning

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

src/Decentralized.Domain/CardLabels.cs

@@ -135,7 +135,7 @@ namespace Decentralized.Domain
             var c = Claim.Truth(u);
             if (kind == DealerKind.Honest) return c;
             c.Model = u.Model;
-            double hide = kind == DealerKind.Scammer ? 1.0 : 0.7;
+            double hide = kind == DealerKind.Scammer ? 1.0 : Tuning.UsedMiddlemanHide;
             foreach (int r in new[] { RowFan, RowFingers, RowBracket, RowPrint, RowSerial, RowSeal })
                 if (rng.Chance(hide)) c = c.With(r, 0);
             return c;