Limit assistance to challenges with multiple active obstacles

frontend/src/components/scene/ChallengePanel.svelte

@@ -126,6 +126,9 @@
                 Temporary Obstacle: <strong use:tooltip={{ html: cardTooltipHtml(ch.temp_card, $obstacleTable, true) }}>{getCardDisplay(ch.temp_card)}</strong> — {playerName(ch.acting_player_id)} must answer it!
             </p>
         {:else}
+            <p class="info-text" style="margin-top: 0.5rem;">{state.obstacles.filter(o => chObstacleIds.includes(o.id)).length > 1
+                ? 'Other Pi-Rats may assist. Assistants do not draw replacement cards.'
+                : 'Only the attempting Pi-Rat can play against this single Obstacle.'}</p>
             <div class="challenge-obstacles">
                 {#each chObstacleIds as oid}
                     {@const obs = state.obstacles.find(o => o.id === oid)}

frontend/src/components/scene/ObstacleItem.svelte

@@ -22,6 +22,11 @@
     $: success_count = column_cards.filter(c => c.success).length;
     $: is_completed = success_count >= state.players.length;
     $: in_challenge = openChallenges.some(c => JSON.parse(c.obstacle_ids || '[]').includes(obs.id));
+    $: challenge = openChallenges.find(c => JSON.parse(c.obstacle_ids || '[]').includes(obs.id));
+    $: canPlay = state.player.role === 'pirat' && !state.player.is_dead && !state.player.needs_reroll
+        && challenge && challenge.tax_state !== 'requested'
+        && (challenge.acting_player_id === state.player.id
+            || state.obstacles.filter(o => JSON.parse(challenge.obstacle_ids || '[]').includes(o.id)).length > 1);
     $: cardCodeLabel = `${cardValue(obs.original_card)}${SUIT_CHAR[obs.suit] || ''}`;
     $: is_face_active = ['J', 'Q', 'K'].includes(active_card_code.slice(0, -1));
 
@@ -61,7 +66,7 @@
          const cardCode = e.dataTransfer.getData('text/plain');
          if (cardCode) {
              if (isJoker(cardCode)) playJoker(cardCode);
-             else playCard(cardCode);
+             else if (canPlay) playCard(cardCode);
          }
      }}>
     {#if error}

frontend/src/lib/changelog.js

@@ -6,10 +6,11 @@
 //   - Add a CHANGELOG entry only when a commit changes something players can
 //     see. Skip refactors, tests, and tooling. Keep wording player-facing.
 
-export const VERSION = 33;
+export const VERSION = 34;
 
 // Newest first. Each entry: { version, date: 'YYYY-MM-DD', changes: [string, ...] }.
 export const CHANGELOG = [
+    { version: 34, date: '2026-09-04', changes: ['Assistance is available only when a Challenge has multiple active Obstacles. Gat and Name Tax takeovers still work against a single Obstacle.'] },
     { version: 33, date: '2026-09-04', changes: ['Hand sizes compare ranks across the crew, including Pi-Rats whose players are the Deep.', 'Discarded cards return to the deck at scene setup. Only the previous Deep can refresh their hand during upkeep, once per scene.'] },
     { version: 32, date: '2026-09-04', changes: ['Obstacles are automatically discarded with their columns once they reach one success per player. Unfinished obstacles carry over between scenes.'] },
     { version: 31, date: '2026-09-04', changes: ['Change your rank-up vote until everyone has voted. The final vote now reveals the result and advances automatically, without a Ready button.', 'The vote result stays visible through upkeep and next-scene setup.'] },