补充浏览器 OPFS 默认路径覆盖

结论：浏览器解释器 smoke 现在验证真实 INI WASM 会话在缺失参数文件和刀具表文件名时回落到默认 OPFS 路径。

wasm-port/docs/compatibility-validation.md

@@ -135,7 +135,8 @@ to reject invalid INI-derived parameter/tool-table file names through the OPFS
 path model after the names are parsed by the LinuxCNC-backed INI WASM SDK. It
 also verifies that explicit session parameter/tool-table file-name options
 override INI-derived names before OPFS text is copied into the LinuxCNC-backed
-WASM filesystem.
+WASM filesystem, and that absent INI file-name values use the default OPFS
+parameter/tool-table paths in a real browser session.
 
 The aggregate host smoke script builds the INI and interpreter-core WASM
 artifacts once, then runs the Node WASM smokes, the Node OPFS mock smoke, and
@@ -279,7 +280,8 @@ session snapshot custom filename handling plus envelope/path rejection
 for unsupported format/version, wrong session id, and invalid snapshot
 filenames, and a browser interpreter smoke that uses the same session bridge
 with real LinuxCNC INI WASM parsing before saving OPFS-backed parameter and
-tool-table text through vendored LinuxCNC file APIs.
+tool-table text through vendored LinuxCNC file APIs, including default OPFS
+path fallback when INI file-name values are absent.
 Full browser coverage, full SDK coverage, and richer machine-state validation
 remain future work.