Two-player decks shed LIFESAVER, as the card itself instructs

"Not applicable in a 2-player game." — the card face. New games deal
from deck revision 2, which removes it when exactly two wizards sit
down; three or more keep it. The revision travels in GameConfig and
the persisted start line, and stored games without one replay against
the original build — changing an existing game's deck composition
would scramble its deterministic replay. Test pins all three cases:
removed at two, present at three, present in legacy two-player games.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packages/engine/src/game.ts

@@ -200,6 +200,12 @@ export interface GameConfig {
    * standees: green, red, magenta, blue, light blue, yellow). Defaults to
    * seat order. */
   colors?: number[];
+  /**
+   * Deck revision. Absent = the original build, which stored games replay
+   * against forever. Revision 2 removes LIFESAVER from two-player decks
+   * ("Not applicable in a 2-player game." — the card face).
+   */
+  deckRev?: number;
 }
 
 export interface GameState {
@@ -2895,7 +2901,11 @@ export function createGame(config: GameConfig): { state: GameState; events: Game
     })),
   );
 
-  const [deckShuffled, rng3] = shuffle(rng, buildDeck(config.sets));
+  let fullDeck = buildDeck(config.sets);
+  if ((config.deckRev ?? 1) >= 2 && n === 2) {
+    fullDeck = fullDeck.filter((c) => c.cardId !== "lifesaver");
+  }
+  const [deckShuffled, rng3] = shuffle(rng, fullDeck);
   rng = rng3;
   const deck = [...deckShuffled];
   const discard: CardInstance[] = [];