feat: thread and persist sub_pattern into accepted questions

tests/unit/test_generated_question_sub_pattern.py

@@ -0,0 +1,73 @@
+"""GeneratedQuestion.sub_pattern 字段 + _to_generated_question 透传。"""
+
+from app.question_gen.generator_v2 import CandidateQuestion
+from app.question_gen.pipeline_v2 import _to_generated_question
+from core.types import GeneratedQuestion
+
+
+def _candidate() -> CandidateQuestion:
+    return CandidateQuestion(
+        question_id="v1_Action Recognition_0001",
+        video_id="v1",
+        task_type="Action Recognition",
+        skill_target="M1_AR",
+        question="厨师最终采用了哪种烹饪方式？",
+        options=("A. 蒸", "B. 炒", "C. 煮", "D. 炸"),
+        answer="A",
+        source_nodes=("n1", "n2"),
+        difficulty="hard",
+    )
+
+
+def test_generated_question_has_sub_pattern_default_none():
+    q = GeneratedQuestion(
+        question_id="q1", video_id="v1", task_type="Action Recognition",
+        question="?", options=("A. x",), answer="A",
+        source_nodes=("n1",), difficulty="easy",
+    )
+    assert q.sub_pattern is None
+
+
+def test_to_generated_question_threads_sub_pattern():
+    q = _to_generated_question(
+        _candidate(), family="ACTION_RECOGNITION",
+        sub_pattern="premature_evidence_anchoring",
+    )
+    assert q.sub_pattern == "premature_evidence_anchoring"
+
+
+def test_to_generated_question_sub_pattern_defaults_none():
+    q = _to_generated_question(_candidate(), family="RETRIEVAL")
+    assert q.sub_pattern is None
+
+
+def test_question_to_entry_includes_sub_pattern():
+    from tools.generate_questions import _question_to_entry
+    q = GeneratedQuestion(
+        question_id="v1_Action Recognition_0001", video_id="v1",
+        task_type="Action Recognition", question="?",
+        options=("A. 蒸", "B. 炒", "C. 煮", "D. 炸"), answer="A",
+        source_nodes=("n1",), difficulty="hard",
+        family="ACTION_RECOGNITION", skill_target="M1_AR",
+        sub_pattern="temporal_reasoning_failure",
+    )
+    entry = _question_to_entry(q)
+    assert entry["sub_pattern"] == "temporal_reasoning_failure"
+    assert entry["question_id"] == "v1_Action Recognition_0001"
+    assert entry["options"] == ["A. 蒸", "B. 炒", "C. 煮", "D. 炸"]
+
+
+def test_append_to_json_writes_sub_pattern(tmp_path):
+    from tools.generate_questions import _append_to_json
+    q = GeneratedQuestion(
+        question_id="v1_Action Recognition_0001", video_id="v1",
+        task_type="Action Recognition", question="?",
+        options=("A. 蒸", "B. 炒", "C. 煮", "D. 炸"), answer="A",
+        source_nodes=("n1",), difficulty="hard",
+        family="ACTION_RECOGNITION", skill_target="M1_AR",
+        sub_pattern="temporal_reasoning_failure",
+    )
+    _append_to_json(tmp_path, q)
+    import json
+    data = json.loads((tmp_path / "v1.json").read_text(encoding="utf-8"))
+    assert data[0]["sub_pattern"] == "temporal_reasoning_failure"