fix(nanoclaude): PYTHONUNBUFFERED + pre-route trace prints

worker 로그 stdout 미출력 해결 + pre-route 분기 추적용 trace.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

nanoclaude/Dockerfile

@@ -19,6 +19,8 @@ COPY infra/ ./infra/
 # Ensure infra has its own dependencies (pydantic, asyncssh already in requirements)
 # Python path: /app is WORKDIR, so "from infra.core..." and "from tools..." both work
 
+ENV PYTHONUNBUFFERED=1
+
 RUN mkdir -p /app/data
 
 EXPOSE 8100

nanoclaude/services/worker.py

@@ -254,9 +254,11 @@ async def run(job: Job) -> None:
         # --- 사전 라우팅 (키워드 기반, EXAONE 스킵) ---
         pre = _pre_route(job.message)
         classify_latency = 0
+        print(f"[TRACE] Job {job.id} pre_route result: {pre}", flush=True)
 
         if pre:
             classification = pre
+            print(f"[TRACE] Job {job.id} PRE-ROUTED: {pre.get('tool','')}.{pre.get('operation','')}", flush=True)
             logger.info("Job %s pre-routed: %s.%s", job.id, pre.get("tool", ""), pre.get("operation", pre.get("action", "")))
         else:
             # --- EXAONE 분류기 호출 ---
@@ -289,6 +291,7 @@ async def run(job: Job) -> None:
         response_text = classification.get("response", "")
         route_prompt = classification.get("prompt", "")
 
+        print(f"[TRACE] Job {job.id} final action='{action}' classification={classification}", flush=True)
         logger.info("Job %s classified as '%s'", job.id, action)
 
         # 대화 기록: 사용자 메시지