added defensive posture options with experimental effect on defense

src/core/game/Game.ts

@@ -333,6 +333,8 @@ export interface Player {
   workers(): number;
   troops(): number;
   targetTroopRatio(): number;
+  defensivePosture(): "retreat" | "balanced" | "hold";
+  setDefensivePosture(p: "retreat" | "balanced" | "hold"): void;
   addGold(toAdd: Gold): void;
   removeGold(toRemove: Gold): void;
   addWorkers(toAdd: number): void;

src/core/game/PlayerImpl.ts

@@ -67,6 +67,8 @@ export class PlayerImpl implements Player {
   // 0 to 100
   private _targetTroopRatio: bigint;
 
+  private _defensivePosture: "retreat" | "balanced" | "hold" = "balanced";
+
   isTraitor_ = false;
 
   private embargoes: Set<PlayerID> = new Set();
@@ -645,6 +647,12 @@ export class PlayerImpl implements Player {
     }
     this._targetTroopRatio = toInt(target * 100);
   }
+  public defensivePosture(): "retreat" | "balanced" | "hold" {
+    return this._defensivePosture;
+  }
+  public setDefensivePosture(p: "retreat" | "balanced" | "hold") {
+    this._defensivePosture = p;
+  }
 
   troops(): number {
     return Number(this._troops);