feat: add AdversarialFilterConfig for Phase B post-hoc filter layer

tests/unit/test_adversarial_config.py

@@ -0,0 +1,38 @@
+"""AdversarialFilterConfig 默认值 + YAML 加载。"""
+
+from app.question_gen.adversarial_config import (
+    AdversarialFilterConfig,
+    load_adversarial_config,
+)
+
+
+def test_defaults():
+    cfg = AdversarialFilterConfig()
+    assert cfg.filter_task_types == ("Action Recognition",)
+    assert cfg.adversarial_max_rounds == 5
+    assert cfg.adversarial_agent_max_steps == 40
+    assert cfg.difficulty_warn_threshold == 0.85
+
+
+def test_load_from_yaml(tmp_path):
+    p = tmp_path / "c.yaml"
+    p.write_text(
+        "adversarial_filter:\n"
+        "  filter_task_types: [Action Recognition, Object Recognition]\n"
+        "  adversarial_max_rounds: 3\n"
+        "  adversarial_agent_max_steps: 20\n"
+        "  difficulty_warn_threshold: 0.7\n",
+        encoding="utf-8",
+    )
+    cfg = load_adversarial_config(p)
+    assert cfg.filter_task_types == ("Action Recognition", "Object Recognition")
+    assert cfg.adversarial_max_rounds == 3
+    assert cfg.adversarial_agent_max_steps == 20
+    assert cfg.difficulty_warn_threshold == 0.7
+
+
+def test_load_missing_section_uses_defaults(tmp_path):
+    p = tmp_path / "c.yaml"
+    p.write_text("question_gen_v2:\n  per_type: 3\n", encoding="utf-8")
+    cfg = load_adversarial_config(p)
+    assert cfg == AdversarialFilterConfig()