initial commit

Outnumbered/Domain/CardKeys.cs

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+namespace Outnumbered;
+
+// Keys for the survival "effect" cards — distinct from StatKeys so EffRun never folds them into a stat; only the effect
+// logic reads them (per-player via the run's IStatBonusSource, or as the two TEAM cards via the driver's team
+// multipliers). CSSharp-free so Domain + the test project can reference them without the engine.
+public static class CardKeys
+{
+    public const string ExplodeKill = "explode_kill";       // 1-pick flag: HE blast on every bot-kill (chains)
+    public const string Burn = "burn";                       // 1-pick flag: on-hit DoT (flat, armor-skipping, per-attacker)
+    public const string AbilityCdr = "ability_cdr";          // -% killstreak-ability cooldown
+    public const string XpMult = "xp_mult";                  // +% run-XP earned
+    public const string HsReduction = "hs_reduction";        // -% incoming headshot damage (per-player, leveled)
+    public const string BerserkPassive = "berserk_passive";  // +dmg scaled by missing HP (per-player, leveled)
+    public const string GlobalDeal = "global_deal";          // TEAM: +dmg dealt, squad-wide, compounding (into MDeal)
+    public const string GlobalTake = "global_take";          // TEAM: -dmg taken, squad-wide, compounding (into MTake)
+}