fix(pipeline): move extra_gates after standard gate pass check

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

app/question_gen/pipeline_v2.py

@@ -487,14 +487,10 @@ async def _process_one_slot(
                 continue
             store.update_gates(item_id, report)
 
-            # 题型专属额外 gate
-            extra_results = strategy.extra_gates(candidate)
-            if any(r.verdict == GateVerdict.FAIL for r in extra_results):
-                prev_reason = "; ".join(
-                    r.reason for r in extra_results if r.verdict == GateVerdict.FAIL
-                )
+            if not report.passed:
+                prev_reason = report.reject_reason
                 logger.info(
-                    "slot {} 额外 gate 失败 (attempt {}/{}): {}",
+                    "slot {} 门控失败 (attempt {}/{}): {}",
                     slot.slot_id,
                     attempt,
                     config.retry_limit,
@@ -502,10 +498,14 @@ async def _process_one_slot(
                 )
                 continue
 
-            if not report.passed:
-                prev_reason = report.reject_reason
+            # 题型专属额外 gate（仅标准门通过后才执行）
+            extra_results = strategy.extra_gates(candidate)
+            if any(r.verdict == GateVerdict.FAIL for r in extra_results):
+                prev_reason = "; ".join(
+                    r.reason for r in extra_results if r.verdict == GateVerdict.FAIL
+                )
                 logger.info(
-                    "slot {} 门控失败 (attempt {}/{}): {}",
+                    "slot {} 额外 gate 失败 (attempt {}/{}): {}",
                     slot.slot_id,
                     attempt,
                     config.retry_limit,