Survival mode bugfixes and revive mechanism

Outnumbered.Tests/BalanceInvariantTests.cs

@@ -100,13 +100,43 @@ public class BalanceInvariantTests
     [Fact]
     public void Per_mode_override_applies_only_named_fields()
     {
-        // The survival override down-weights the skill factors so the WAVE FLOOR drives difficulty; everything else inherits.
+        // The survival override zeroes every skill factor so the WAVE FLOOR alone drives difficulty; everything else inherits.
         var baseH = T.Hcap();
         var ov = T.Surv().Handicap!;                  // the default survival override
         var eff = ov.ApplyTo(baseH);
-        Assert.Equal(0.3, eff.KdWeight);              // overridden
+        Assert.Equal(0.0, eff.KdWeight);              // overridden -> in-run performance cannot move the handicap
+        Assert.Equal(0.0, eff.HsWeight);
+        Assert.Equal(0.0, eff.StreakWeight);
+        Assert.Equal(0.0, eff.LevelWeight);
+        Assert.Equal(0.0, eff.ProgressWeight);
         Assert.Equal(10.0, eff.MTakeCeiling);         // overridden
         Assert.Equal(baseH.MasterDifficulty, eff.MasterDifficulty); // inherited from base (not set in the override)
         Assert.Equal(baseH.Curve, eff.Curve);          // inherited
     }
+
+    [Fact]
+    public void Survival_handicap_is_wave_only_and_invariant_to_performance()
+    {
+        // Bug fix: survival's handicap must depend ONLY on the wave (via the floor), never on K/D / headshots / streak /
+        // level. A dominant player and a struggling player on the SAME wave get the SAME t, and killing more bots inside a
+        // wave never changes it — so the 1st and the 100th kill of a wave take identical shots. (Before, K/D + HS saturated
+        // after a handful of kills and drove a good player straight to the floor mid-wave-1.)
+        var rh = T.Resolved(T.Surv().Handicap!.ApplyTo(T.Hcap()));
+
+        foreach (var wave in new[] { 1, 5, 12, 25 })
+        {
+            double floor = SurvivalEconomy.HandicapFloor(wave, T.Surv());
+            double dominant = HandicapModel.ComputeT(
+                T.Snap(level: 100, kills: 60, deaths: 0, headshotKills: 60, streak: 50, floor: floor), rh);
+            double struggling = HandicapModel.ComputeT(
+                T.Snap(level: 1, kills: 0, deaths: 20, headshotKills: 0, streak: 0, floor: floor), rh);
+            double freshMidWave = HandicapModel.ComputeT(
+                T.Snap(level: 1, kills: 7, deaths: 0, headshotKills: 7, streak: 7, floor: floor), rh);
+
+            Assert.Equal(dominant, struggling, Eps);      // same wave -> same handicap, regardless of performance
+            Assert.Equal(dominant, freshMidWave, Eps);
+            // it IS just the eased wave floor (floor >= 0 for any real wave, so Ease reduces to Pow)
+            Assert.Equal(Math.Pow(floor, rh.Config.Curve), dominant, Eps);
+        }
+    }
 }