feat(signal_v2-phase3b): post-close cycle + minute momentum update

scheduler._is_post_close_trigger: 16:00 KST ±1min detection (market day).
pull_worker:
- _run_post_close_cycle: daily fetch (60일) + chronos batch predict →
  state.chronos_predictions + state.daily_ohlcv.
- update_minute_momentum_for_all: 매 cycle 마다 state.minute_momentum 갱신.
- poll_loop signature 확장 (chronos optional).

45 tests pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

signal_v2/pull_worker.py

@@ -7,7 +7,7 @@ from datetime import datetime
 
 from signal_v2.kis_client import KISClient
 from signal_v2.scheduler import (
-    KST, _is_market_day, _is_polling_window, _next_interval,
+    KST, _is_market_day, _is_polling_window, _next_interval, _is_post_close_trigger,
 )
 from signal_v2.state import PollState
 from signal_v2.stock_client import StockClient
@@ -18,6 +18,7 @@ logger = logging.getLogger(__name__)
 async def poll_loop(
     client: StockClient, state: PollState, shutdown: asyncio.Event,
     kis_client: KISClient | None = None,
+    chronos=None,
 ) -> None:
     """FastAPI lifespan 에서 asyncio.create_task 로 시작."""
     logger.info("poll_loop started")
@@ -28,6 +29,17 @@ async def poll_loop(
                 await _run_polling_cycle(client, state, kis_client=kis_client)
             except Exception:
                 logger.exception("poll cycle failed")
+            # Minute momentum 갱신 (매 cycle)
+            try:
+                update_minute_momentum_for_all(state)
+            except Exception:
+                logger.exception("minute momentum update failed")
+            # Post-close trigger (16:00 KST)
+            if _is_post_close_trigger(now) and chronos is not None and kis_client is not None:
+                try:
+                    await _run_post_close_cycle(kis_client, chronos, state)
+                except Exception:
+                    logger.exception("post-close cycle failed")
         interval = _next_interval(now)
         try:
             await asyncio.wait_for(shutdown.wait(), timeout=interval)
@@ -125,3 +137,48 @@ def _screener_tickers(state: PollState) -> list[str]:
     if state.screener_preview is None:
         return []
     return [i["ticker"] for i in state.screener_preview.get("items", []) if "ticker" in i]
+
+
+async def _run_post_close_cycle(kis_client, chronos, state) -> None:
+    """16:00 KST 종가 후 1회: daily fetch + chronos predict."""
+    tickers = list(set(_portfolio_tickers(state)) | set(_screener_tickers(state)))
+    if not tickers:
+        return
+
+    daily_results = await asyncio.gather(*[
+        kis_client.get_daily_ohlcv(t, days=60) for t in tickers
+    ], return_exceptions=True)
+    daily_dict = {}
+    for ticker, result in zip(tickers, daily_results):
+        if isinstance(result, list) and len(result) >= 30:
+            daily_dict[ticker] = result
+            state.daily_ohlcv[ticker] = result
+        elif isinstance(result, Exception):
+            state.fetch_errors[f"daily_ohlcv/{ticker}"] = (
+                state.fetch_errors.get(f"daily_ohlcv/{ticker}", 0) + 1
+            )
+
+    if daily_dict and chronos is not None:
+        try:
+            predictions = chronos.predict_batch(daily_dict)
+        except Exception:
+            logger.exception("chronos predict_batch failed")
+            return
+        for ticker, pred in predictions.items():
+            state.chronos_predictions[ticker] = {
+                "median": pred.median,
+                "q10": pred.q10,
+                "q90": pred.q90,
+                "conf": pred.conf,
+                "as_of": pred.as_of,
+            }
+            state.last_updated[f"chronos/{ticker}"] = pred.as_of
+
+
+def update_minute_momentum_for_all(state) -> None:
+    """매 분봉 cycle 후 호출 — 모든 종목 모멘텀 갱신."""
+    from signal_v2.momentum_classifier import classify_minute_momentum
+    now_iso = datetime.now(KST).isoformat()
+    for ticker, bars in state.minute_bars.items():
+        state.minute_momentum[ticker] = classify_minute_momentum(bars)
+        state.last_updated[f"momentum/{ticker}"] = now_iso