feat(app): add PoolStrategy Protocol to application ports

tests/unit/test_core_protocols.py

@@ -65,3 +65,26 @@ def test_plain_object_does_not_satisfy() -> None:
     assert not isinstance(object(), LLMProvider)
     assert not isinstance(object(), VLMProvider)
     assert not isinstance(object(), TelemetryRecorder)
+
+
+from app.ports import PoolStrategy
+
+
+class TestPoolStrategyProtocol:
+    """PoolStrategy Protocol runtime_checkable 验证。"""
+
+    def test_pool_strategy_is_runtime_checkable(self) -> None:
+        """PoolStrategy 支持 isinstance 检查。"""
+        from app.harness.pools import Pools
+
+        class FakeStrategy:
+            def build(self, questions, correctness, config):
+                return Pools(
+                    diagnosis=[], validation=[], test=[],
+                    baseline_run_id="", baseline_val_accuracy=0.0,
+                )
+
+            def build_incremental(self, new_task_types, questions, correctness, config):
+                return {}
+
+        assert isinstance(FakeStrategy(), PoolStrategy)