feat: add uses_grounded_selector strategy switch (AR only)

app/question_gen/strategy.py

@@ -91,6 +91,9 @@ class TaskTypeStrategy(Protocol):
     @property
     def leak_probe_template(self) -> str: ...
 
+    @property
+    def uses_grounded_selector(self) -> bool: ...
+
     def select_sub_pattern(self, rng: random.Random) -> SubPattern | None: ...
 
     def build_prompt_context(self, material: Any, sub_pattern: SubPattern | None) -> dict: ...
@@ -168,6 +171,11 @@ class BaseTaskTypeStrategy:
         """返回泄漏探测模板文件名（委托给绑定的 family.leak_profile）。"""
         return self._family.leak_profile.probe_template
 
+    @property
+    def uses_grounded_selector(self) -> bool:
+        """默认不启用 grounded selector（11 类题型走原路径）。"""
+        return False
+
     def select_sub_pattern(self, rng: random.Random) -> SubPattern | None:
         """BaseTaskTypeStrategy 无子模式。"""
         return None

app/question_gen/strategy_action_recognition.py

@@ -289,6 +289,11 @@ class ActionRecognitionStrategy:
         """返回泄漏探测模板文件名。"""
         return "gate_leak_retrieval.md"
 
+    @property
+    def uses_grounded_selector(self) -> bool:
+        """AR 启用候选池 + VLM 视觉打分 selector。"""
+        return True
+
     def select_sub_pattern(self, rng: random.Random) -> SubPattern:
         """按权重随机选择一个 SubPattern。
 

tests/unit/test_strategy_grounded_flag.py

@@ -0,0 +1,19 @@
+"""uses_grounded_selector 分流：仅 AR=True，其余 11 类=False。"""
+
+from app.question_gen.strategy import get_strategy
+
+_NON_AR = [
+    "Action Reasoning", "Attribute Perception", "Counting Problem",
+    "Information Synopsis", "Object Recognition", "Object Reasoning",
+    "OCR Problems", "Spatial Perception", "Spatial Reasoning",
+    "Temporal Perception", "Temporal Reasoning",
+]
+
+
+def test_action_recognition_uses_grounded_selector():
+    assert get_strategy("Action Recognition").uses_grounded_selector is True
+
+
+def test_non_ar_do_not_use_grounded_selector():
+    for tt in _NON_AR:
+        assert get_strategy(tt).uses_grounded_selector is False, tt