feat: seed carries frozen pools.json into training workspace

tests/unit/test_harness_workspace.py

@@ -183,6 +183,23 @@ def test_init_workspace_from_seed_missing_questions(store_dir: Path, workspace_d
     assert not workspace_dir.exists()
 
 
+def test_init_workspace_from_seed_carries_pools(store_dir: Path, workspace_dir: Path) -> None:
+    """seed 目录含 pools.json/split_manifest.json 时拷入 workspace。"""
+    # store_dir fixture 已构造 seed "initial"；补冻结产物到 seed 目录再初始化 workspace。
+    seed_dir = store_dir / "seeds" / "initial"
+    (seed_dir / "pools.json").write_text('{"split_mode":"global"}')
+    (seed_dir / "split_manifest.json").write_text('{"pools_sha256":"a"}')
+
+    init_workspace_from_seed(
+        workspace_dir,
+        store_dir,
+        seed_name="initial",
+        questions="benchmarks/Video-MME",
+    )
+    assert (workspace_dir / "pools.json").exists()
+    assert (workspace_dir / "split_manifest.json").exists()
+
+
 # ---------------------------------------------------------------------------
 # load_manifest
 # ---------------------------------------------------------------------------