Rev 22: the self-stack resolves — one wizard cannot bounce to himself

A democratic monster touching its own creator opens a stack where one
player wears both hats, and doPass matched the attacker first: every
pass "bounced the exchange to the defender" — the same wizard —
forever. Room 928D livelocked there at seq 83; once the boot kick
revived its pump, the automaton politely passed 389 times. At rev 22
a self-stack pass RESOLVES (the claw lands, the game moves on);
older ledgers hold their recorded bounces and replay so. 928D itself
was repaired by truncating the no-op run and lifting it to rev 22,
verified clean and unstuck on a copy before installation.

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

packages/engine/src/game.ts

@@ -5071,7 +5071,13 @@ function doPass(prev: GameState, playerId: PlayerId): CommandResult {
   const state = clone(prev);
   const stack = state.stack!;
   const events: GameEvent[] = [];
-  if (playerId === stack.attackerId) {
+  // A self-stack (a democratic monster touching its own creator) has one
+  // party wearing both hats: their pass RESOLVES — bouncing it "to the
+  // defender" would hand the exchange back to themselves forever
+  // (rules rev 22; older ledgers hold those no-op bounces and replay so).
+  const selfStack =
+    stack.attackerId === stack.defenderId && (state.config.deckRev ?? 1) >= 22;
+  if (playerId === stack.attackerId && !selfStack) {
     // The attacker declining to answer bounces the exchange back so the
     // defender may stack further counters — but not past a total stop:
     // re-prompting then reads as "your shield failed" and goads the table