Add maze mini-boss and rebalance progression

web/src/MazeGuard.ts

@@ -0,0 +1,22 @@
+import type { Game } from './Game';
+import { Ghost } from './Ghost';
+
+const ACTIVATE_RADIUS = 8;
+
+// Labyrinth-Wächter: steht still am Wegpunkt und greift erst an,
+// wenn der Spieler in die Nähe kommt.
+export class MazeGuard extends Ghost {
+  private activated = false;
+
+  protected chase(dt: number, game: Game) {
+    if (!this.activated) {
+      const dx = game.player.body.position.x - this.body.position.x;
+      const dz = game.player.body.position.z - this.body.position.z;
+      if (Math.hypot(dx, dz) < ACTIVATE_RADIUS) {
+        this.activated = true;
+      }
+      return;
+    }
+    super.chase(dt, game);
+  }
+}