feat(build): 任务书 02 第四阶段代码——build 装入 CEUS 结果

- build.yaml 加必填字段 ceus_run（CEUS 运行目录或 null）。
- 不为 null 时按视频号找结果；在 failed.csv 里或缺结果目录的整例跳过，记 C15；关键帧图沿用 C14 检查。
- 资料库超声一路加 keyframes/<槽位>.png（去附加数据重编码）和 tic.json（白名单逐字段构造：
  四条曲线的拟合成败与 R²、灌注指标、紫圈曲线是否可用、7 个槽位的定位与视频时间或原因）。
- manifest 的 CEUS 来源写运行号；泄露扫描已覆盖 tic.json，补命中测试。
- 真实构建等配准改完、全量 CEUS 运行之后再做。

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_build_stops.py

@@ -28,7 +28,7 @@ def _assert_no_finished_build(tmp_path: Path) -> None:
 
 
 def _run(tmp_path: Path, root: Path, code_maps: dict[str, dict[int, str]] | None) -> None:
-    run_build(write_config(tmp_path, root, 7, code_maps), REPO_ROOT, NOW)
+    run_build(write_config(tmp_path, root, 7, code_maps, None), REPO_ROOT, NOW)
 
 
 def test_t1_missing_summary_table(tmp_path: Path) -> None:
@@ -111,7 +111,7 @@ def _write_yaml(tmp_path: Path, body: str) -> Path:
     return path
 
 
-_BASE = "delivery_dir: d\nlibrary_root: l\nanswers_root: a\nalias_seed: 1\n"
+_BASE = "delivery_dir: d\nlibrary_root: l\nanswers_root: a\nalias_seed: 1\nceus_run: null\n"
 
 
 def test_config_decode_true_needs_code_maps(tmp_path: Path) -> None:
@@ -152,12 +152,24 @@ def test_config_relative_paths_resolve_against_repo_root(tmp_path: Path) -> None
     assert config.library_root == Path("/repo/l")
     assert config.answers_root == Path("/repo/a")
     assert config.code_maps is None
+    assert config.ceus_run is None
+    body = _BASE.replace("ceus_run: null", "ceus_run: runs/ceus/r")
+    path = _write_yaml(tmp_path, body + "decode_codes: false\ncode_maps: null\n")
+    assert load_build_config(path, Path("/repo")).ceus_run == Path("/repo/runs/ceus/r")
+
+
+def test_config_ceus_run_missing(tmp_path: Path) -> None:
+    body = _BASE.replace("ceus_run: null\n", "")
+    path = _write_yaml(tmp_path, body + "decode_codes: false\ncode_maps: null\n")
+    with pytest.raises(ValidationError, match="ceus_run"):
+        load_build_config(path, tmp_path)
 
 
 def test_committed_config_is_valid() -> None:
     config = load_build_config(REPO_ROOT / "config" / "build.yaml", REPO_ROOT)
     assert config.decode_codes is False
     assert config.code_maps is None
+    assert config.ceus_run is None
 
 
 def test_config_duplicate_key(tmp_path: Path) -> None: