删掉回放的五个转发、重复的空格快捷键与重复的等待循环。

回放调用点直接走 replay_ctl，场景工具的路径引导收敛到 _paths，panel_snapshot
复用 panel_check 的 _wait_for，report_from 收成模块私有的 _report_from。

tools/scene_assets/validate_scene.py

@@ -25,13 +25,11 @@ import json
 import sys
 from pathlib import Path
 
+# Tests load this tool by file location, so add our own directory to the path.
+if str(Path(__file__).resolve().parent) not in sys.path:
+    sys.path.insert(0, str(Path(__file__).resolve().parent))
 
-def _bootstrap_paths() -> None:
-    here = Path(__file__).resolve()
-    repo = here.parents[2]
-    for path in (repo / "apps" / "studio" / "src", repo / "shared" / "src"):
-        if path.is_dir() and str(path) not in sys.path:
-            sys.path.insert(0, str(path))
+from _paths import bootstrap_paths  # noqa: E402
 
 
 def _legacy_report(args) -> tuple[int, dict]:
@@ -308,7 +306,7 @@ def main(argv: list[str] | None = None) -> int:
     parser.add_argument("--json", action="store_true", help="machine-readable output")
     args = parser.parse_args(argv)
 
-    _bootstrap_paths()
+    bootstrap_paths()
     if args.legacy_dir is not None:
         if args.map is None:
             print("--legacy-dir also needs --map", file=sys.stderr)