按规划继续工作

结论：补齐通用会话快照 envelope 的格式、版本、会话 ID 与对象形状拒绝验证，覆盖 Node OPFS 与 Chromium OPFS 路径，并通过 host/WASM/browser 聚合验证。

wasm-port/docs/drift-report.md

@@ -70,8 +70,9 @@ semantic rewrites:
   host-side path model, generic session snapshot storage, pure-text machine
   file and G-code storage, parameter/tool-table bridge copying into the
   interpreter SDK filesystem, grouped machine-session loading, explicit
-  session file-name overrides, invalid INI-derived machine file names, and a
-  Chromium localhost round trip for those persistence paths.
+  session file-name overrides, invalid INI-derived machine file names, generic
+  session snapshot envelope rejection paths, and a Chromium localhost round
+  trip for those persistence paths.
 - Host-side smoke validation is aggregated by
   `tests/host/verify_host_smokes.sh` so Node, WASM, OPFS, and browser checks
   run from one command.