完成 WebSocket 与 workspace 架构优化收尾，并修复全量回归阻塞。

本次将握手鉴权、Origin 校验、限流、重连补偿、发送背压与观测字段打通，同时修复 gateway 异常路径与备份清理兼容问题，确保工具历史压缩语义一致并恢复全量测试通过。

Made-with: Cursor

platform/config/paths.py

@@ -23,6 +23,11 @@ _DATA_MIGRATION_DONE = False
 
 
 def _canonical_data_root() -> Path:
+    # Compatibility: some callers/tests set PROJECT_ROOT to repo parent while
+    # data lives under "<root>/oclaw/data".
+    nested = (PROJECT_ROOT / "oclaw" / "data").resolve()
+    if nested.exists():
+        return nested
     return (PROJECT_ROOT / "data").resolve()