feat(tests/desktop): add record_screencast.py.sample template

Generic screencast recording entry point for skill demo videos.
Copy to record_screencast.py and update SKILL_SLUG + SUBTITLE_SCRIPT.
Requires jiangchang-platform-kit/tools/screencast + mss + ffmpeg.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/desktop/record_screencast.py.sample

@@ -0,0 +1,81 @@
+# -*- coding: utf-8 -*-
+"""
+Screencast 录制入口（模板）。
+
+启用方式：
+  复制为 record_screencast.py，修改 SKILL_SLUG 和 SUBTITLE_SCRIPT，然后运行：
+    python tests/desktop/record_screencast.py
+
+依赖：
+  1. pip install mss
+  2. 系统已安装 ffmpeg 并在 PATH 中
+  3. jiangchang-platform-kit 在本机可推断路径（见 _bootstrap 逻辑）
+  4. MEDIA_ASSETS_ROOT 环境变量指向 media-assets 仓库（或使用默认路径）
+"""
+from __future__ import annotations
+
+import os
+import sys
+from pathlib import Path
+
+
+def _bootstrap_screencast() -> None:
+    """将 jiangchang-platform-kit/tools 加入 sys.path，使 screencast 包可导入。"""
+    here = Path(__file__).resolve()
+    skill_root = here.parents[2]           # tests/desktop → tests → skill_root
+    workspace_root = skill_root.parent     # skill_root → workspace
+    open_claw_root = workspace_root.parent # workspace → OpenClaw
+
+    candidates = [
+        workspace_root / "jiangchang-platform-kit" / "tools",
+        open_claw_root / "jiangchang-platform-kit" / "tools",
+        Path(r"D:\AI\jiangchang-platform-kit") / "tools",
+    ]
+    env_kit = os.environ.get("JIANGCHANG_KIT_ROOT", "")
+    if env_kit:
+        candidates.insert(0, Path(env_kit) / "tools")
+
+    for cand in candidates:
+        if (cand / "screencast" / "__init__.py").exists():
+            if str(cand) not in sys.path:
+                sys.path.insert(0, str(cand))
+            return
+
+    raise RuntimeError(
+        "找不到 jiangchang-platform-kit/tools/screencast。\n"
+        "请设置 JIANGCHANG_KIT_ROOT 环境变量，或将 platform-kit 放在 workspace 同级目录。"
+    )
+
+
+_bootstrap_screencast()
+
+from screencast import run_screencast  # noqa: E402
+
+# ============================================================
+# ↓↓↓ 复制后只需修改这两处 ↓↓↓
+# ============================================================
+
+SKILL_SLUG = "your-skill-slug"   # 替换为本技能 slug
+
+SUBTITLE_SCRIPT = [
+    # (pytest stdout 中出现的关键词,  字幕显示文案)
+    ("ensure_app_running",   "正在启动匠厂智能体平台..."),
+    ("wait_gateway_ready",   "网关就绪，准备发起任务"),
+    ("ask(",                 "向助手发送指令..."),
+    ("PASSED",               "任务完成"),
+]
+
+# ============================================================
+
+if __name__ == "__main__":
+    _here = Path(__file__).resolve()
+    skill_root = _here.parents[2]
+    test_file = str(_here.parent / "test_desktop_smoke.py")
+    output_dir = str(_here.parent / "artifacts" / "recordings")
+
+    run_screencast(
+        skill_slug=SKILL_SLUG,
+        subtitle_script=SUBTITLE_SCRIPT,
+        pytest_args=[test_file, "-v", "-s"],
+        output_dir=output_dir,
+    )