fix: agent selection bypasses multi-agent workflow to ensure selected agent system prompt is applied

src/agent.ts

@@ -230,7 +230,10 @@ export class AgentExecutor {
         const runId = options.runId ?? (loopDepth === 0 ? ++this.runSerial : this.activeRunId);
 
         // Decide whether to use Multi-Agent Workflow as an internal execution strategy.
-        if (loopDepth === 0 && this.shouldUseMultiAgentWorkflow(prompt || '', multiAgentEnabled)) {
+        // [Critical Fix] 사용자가 에이전트를 명시적으로 선택한 경우, 해당 에이전트의 system prompt를
+        // 최우선으로 적용해야 하므로 멀티에이전트 워크플로우 분기를 우회합니다.
+        const hasExplicitAgentSelection = !!options.agentSkillContext;
+        if (loopDepth === 0 && !hasExplicitAgentSelection && this.shouldUseMultiAgentWorkflow(prompt || '', multiAgentEnabled)) {
             return this.executeMultiAgentWorkflow(prompt!, modelName, options);
         }