feat(app): add PoolStrategy Protocol to application ports

app/ports.py

@@ -8,8 +8,9 @@ from typing import TYPE_CHECKING, Any, Protocol, runtime_checkable
 if TYPE_CHECKING:
     import numpy as np
 
+    from app.harness.pools import Pools
     from app.tree.index import TreeIndex
-    from core.types import GeneratedQuestion
+    from core.types import GeneratedQuestion, PoolConfig
 
 
 @runtime_checkable
@@ -144,3 +145,27 @@ class PromptBuilderFactory(Protocol):
         skills_dir: Path | None = None,
         prompts_dir: Path | None = None,
     ) -> PromptBuilderFn: ...
+
+
+@runtime_checkable
+class PoolStrategy(Protocol):
+    """池构建策略端口。
+
+    应用层端口（非 core 层），因为返回类型 Pools 定义在 app/harness/pools.py。
+    两个具体策略（GlobalPoolStrategy / PerCategoryPoolStrategy）实现此接口。
+    """
+
+    def build(
+        self,
+        questions: list[GeneratedQuestion],
+        correctness: dict[str, bool],
+        config: PoolConfig,
+    ) -> Pools: ...
+
+    def build_incremental(
+        self,
+        new_task_types: list[str],
+        questions: list[GeneratedQuestion],
+        correctness: dict[str, bool],
+        config: PoolConfig,
+    ) -> dict[str, dict[str, list[str]]]: ...

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)