task-1: 建立 Similar ASIN 性能基线夹具 (1000/5000行、图片开关、chunk与payload采样)

新增 SimilarAsinPerfFixture 确定性夹具：按 sourceFileKey+rowIndex 派生字段，
支持 0/1/1000/5000 行、图片开关两种模式、chunk 划分与 payload 字节采样；
空输入返回空、超限(>5000行/非法chunk/空key)抛 IllegalArgumentException。
含 10 个测试覆盖默认路径/批量/幂等/边界/非法输入/依赖失败恢复。

check_progress.py

@@ -0,0 +1,50 @@
+#!/usr/bin/env python3
+"""检查 app_client 的 Step 2/后续开发任务是否全部完成。"""
+from __future__ import annotations
+
+import json
+import sys
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parent
+PROGRESS_PATH = ROOT / "progress.json"
+
+
+def main() -> int:
+    if not PROGRESS_PATH.is_file():
+        print("progress.json not found", file=sys.stderr)
+        return 2
+
+    try:
+        data = json.loads(PROGRESS_PATH.read_text(encoding="utf-8"))
+    except Exception as exc:
+        print(f"invalid progress.json: {exc}", file=sys.stderr)
+        return 2
+
+    total = data.get("total_tasks")
+    tasks = data.get("tasks")
+    if not isinstance(total, int) or total <= 0 or not isinstance(tasks, list):
+        print("invalid progress shape", file=sys.stderr)
+        return 2
+    if len(tasks) != total:
+        print(f"task count mismatch: total_tasks={total}, tasks={len(tasks)}", file=sys.stderr)
+        return 2
+
+    ids = [task.get("id") for task in tasks if isinstance(task, dict)]
+    if ids != list(range(1, total + 1)):
+        print("task ids are not contiguous from 1", file=sys.stderr)
+        return 2
+
+    pending = [task for task in tasks if task.get("status") != "done"]
+    if pending:
+        print(f"pending tasks: {len(pending)}/{total}")
+        print("all tasks done: false")
+        return 1
+
+    print(f"all tasks done: true ({total})")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())