feat(ack): shard task records for merge-safe workspaces

skills/ack/scripts/validate_delivery.py

@@ -22,15 +22,7 @@ import sys
 from pathlib import Path, PurePosixPath
 from typing import Any
 
-from yaml_subset import (
-    DuplicateKeyError,
-    YamlSubsetError,
-    load_json_unique,
-    load_yaml_subset,
-    make_unique_pyyaml_loader,
-)
-
-
+from task_store import TaskStoreError, is_task_store_manifest, materialize_board, parse_document
 ID_RE = re.compile(r"^[a-z][a-z0-9-]{0,63}$")
 RELATIVE_PATH_RE = re.compile(r"^[A-Za-z0-9._/*?+-]+$")
 PLATFORM_RE = re.compile(r"^[a-z0-9]+/[A-Za-z0-9._-]+$")
@@ -162,36 +154,12 @@ def _reject_unknown(
 
 def _load_document(path: Path, label: str) -> dict[str, Any]:
     try:
-        content = path.read_text(encoding="utf-8")
-    except OSError as exc:
+        data = parse_document(path)
+        if is_task_store_manifest(data):
+            data = materialize_board(data, path)
+    except TaskStoreError as exc:
         sys.stderr.write(f"{label}读取失败: {exc}\n")
         raise SystemExit(1)
-
-    if path.suffix.lower() == ".json":
-        try:
-            data = load_json_unique(content)
-        except (json.JSONDecodeError, DuplicateKeyError) as exc:
-            sys.stderr.write(f"{label} JSON 解析失败: {exc}\n")
-            raise SystemExit(1)
-    else:
-        try:
-            import yaml  # type: ignore
-        except ImportError:
-            try:
-                data = load_yaml_subset(content)
-            except YamlSubsetError as exc:
-                sys.stderr.write(f"{label} YAML 子集解析失败: {exc}\n")
-                raise SystemExit(1)
-        else:
-            try:
-                data = yaml.load(content, Loader=make_unique_pyyaml_loader(yaml))
-            except yaml.YAMLError as exc:  # type: ignore
-                sys.stderr.write(f"{label} YAML 解析失败: {exc}\n")
-                raise SystemExit(1)
-
-    if not isinstance(data, dict):
-        sys.stderr.write(f"{label}顶层必须是对象（mapping）\n")
-        raise SystemExit(1)
     return data