feat: v3 — fight loop, expanded challenges, FightPage ownership guard

- Add fight-loop CLI for automated mock fights with elo-based matchmaking
- Expand challenge types, scoring narrations, arenas, and mock bot pool
- FightPage "Fight again" buttons now only show for your own bot
- FightViewer async scene init, live fight polling with round counter
- Extract mock answers into separate answers module

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

frontend/src/pages/FightPage.vue

@@ -13,7 +13,9 @@ const isLoading = ref(true)
 const isRequeueing = ref(false)
 const isLive = ref(false)
 const liveRounds = ref(0)
+const fightError = ref('')
 let pollHandle: ReturnType<typeof setInterval> | null = null
+let pollCount = 0
 
 async function loadFight(): Promise<string | null> {
   try {
@@ -34,13 +36,25 @@ onMounted(async () => {
   const status = await loadFight()
   isLoading.value = false
 
-  if (status !== 'finished') {
+  if (status === null) {
+    // Fight doesn't exist yet — might still be creating. Poll briefly.
     isLive.value = true
+  } else if (status !== 'finished') {
+    isLive.value = true
+  }
+
+  if (isLive.value) {
     pollHandle = setInterval(async () => {
+      pollCount++
       const s = await loadFight()
       if (s === 'finished') {
         isLive.value = false
         if (pollHandle) { clearInterval(pollHandle); pollHandle = null }
+      } else if (pollCount > 60) {
+        // 90 seconds max wait
+        isLive.value = false
+        fightError.value = 'Fight took too long. It may still be running — try refreshing.'
+        if (pollHandle) { clearInterval(pollHandle); pollHandle = null }
       }
     }, 1500)
   }
@@ -78,6 +92,17 @@ async function fightAgain(botId: string) {
       </p>
     </div>
 
+    <div v-else-if="fightError" class="flex-1 flex flex-col items-center justify-center gap-3">
+      <p class="font-display text-ko text-sm tracking-wider">{{ fightError }}</p>
+      <button
+        class="px-6 py-2 border border-neon-cyan/40 text-neon-cyan font-display font-bold text-xs tracking-wider
+               hover:bg-neon-cyan/10 transition-all"
+        @click="$router.push('/join')"
+      >
+        BACK TO LOBBY
+      </button>
+    </div>
+
     <div v-else-if="!fight" class="flex-1 flex items-center justify-center">
       <p class="font-display text-text-muted">Fight not found.</p>
     </div>