fix: pass forHuman flag to pickChallenge in fight orchestrator

Only generate multiple choice options when a human player is in the fight.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/engine/orchestrator.ts

@@ -353,6 +353,7 @@ async function executeFightRounds(fightId: string, botA: BotRecord, botB: BotRec
   let winnerId: string | null = null
   let lastRound = 0
   const usedTypes = new Set<string>()
+  const hasHuman = isHumanPlayer(botA.webhookUrl) || isHumanPlayer(botB.webhookUrl)
 
   // Pick a random round for retro mode (rounds 3-8, ensuring it's not too early or late)
   const retroRound = 3 + Math.floor(Math.random() * Math.min(6, MAX_ROUNDS - 4))
@@ -361,7 +362,7 @@ async function executeFightRounds(fightId: string, botA: BotRecord, botB: BotRec
     lastRound = round
     const challenge = round === retroRound
       ? generateRetroChallenge()
-      : pickChallenge(usedTypes, arena.modifier, undefined, round)
+      : pickChallenge(usedTypes, arena.modifier, undefined, round, hasHuman)
     usedTypes.add(challenge.type)
 
     emit(fightId, 'round_start', {