feat(signal_v2-phase4-task3): integrate signal_generator into poll_loop

poll_loop now accepts dedup + settings kwargs (backwards-compatible defaults).
After each in-window cycle (stock pull + minute momentum + optional post-close),
generate_signals is called to populate state.signals for downstream Phase 5
pickup. main.py lifespan wires _ctx.dedup + settings into the poll_loop task.

1 integration test added (anomaly-free stop_loss path via direct generate_signals
call, exercises the same code path that poll_loop runs).

56 tests pass.

signal_v2/pull_worker.py

@@ -19,6 +19,8 @@ async def poll_loop(
     client: StockClient, state: PollState, shutdown: asyncio.Event,
     kis_client: KISClient | None = None,
     chronos=None,
+    dedup=None,
+    settings=None,
 ) -> None:
     """FastAPI lifespan 에서 asyncio.create_task 로 시작."""
     logger.info("poll_loop started")
@@ -40,6 +42,13 @@ async def poll_loop(
                     await _run_post_close_cycle(kis_client, chronos, state)
                 except Exception:
                     logger.exception("post-close cycle failed")
+            # Phase 4: generate signals
+            if dedup is not None and settings is not None:
+                try:
+                    from signal_v2.signal_generator import generate_signals
+                    generate_signals(state, dedup, settings)
+                except Exception:
+                    logger.exception("generate_signals failed")
         interval = _next_interval(now)
         try:
             await asyncio.wait_for(shutdown.wait(), timeout=interval)