按规划继续工作

结论：补齐 INI 派生自定义参数文件路径的浏览器 OPFS 保存和备份读回验证，继续通过 vendored LinuxCNC save_parameters 路径覆盖。

wasm-port/tests/browser/interp_smoke.html

@@ -587,6 +587,64 @@
           "parameter_5399=99",
         ].join("\n"),
       );
+      const savedIniNamedParameters = await saveMachineParametersToOpfs(
+        interp,
+        "browser-ini-file-session",
+        {
+          5161: 33.75,
+          5162: 67.5,
+          5220: 1.0,
+          5221: 5.25,
+          5399: 199,
+        },
+        {
+          opfsPath: loadedIniFileSession.parameters.opfsPath,
+          wasmPath: loadedIniFileSession.parameters.wasmPath,
+        },
+      );
+      if (
+        savedIniNamedParameters.opfsPath !==
+        "linuxcnc/machines/browser-ini-file-session/browser-custom.var"
+      ) {
+        throw new Error(`unexpected custom saved parameter path: ${savedIniNamedParameters.opfsPath}`);
+      }
+      if (
+        savedIniNamedParameters.backupOpfsPath !==
+        "linuxcnc/machines/browser-ini-file-session/browser-custom.var.bak"
+      ) {
+        throw new Error(`unexpected custom parameter backup path: ${savedIniNamedParameters.backupOpfsPath}`);
+      }
+      verifyExpectedOutput(
+        "opfs_save_ini_named_parameter_file",
+        savedIniNamedParameters.result,
+        [
+          "save_parameters=0",
+          "parameter_5161=33.75",
+          "parameter_5162=67.5",
+          "parameter_5221=5.25",
+          "parameter_5399=199",
+        ].join("\n"),
+      );
+      verifyExpectedOutput(
+        "opfs_saved_ini_named_parameter_text",
+        await loadTextFile(loadedIniFileSession.parameters.opfsPath),
+        [
+          "5161\t33.750000",
+          "5162\t67.500000",
+          "5221\t5.250000",
+          "5399\t199.000000",
+        ].join("\n"),
+      );
+      verifyExpectedOutput(
+        "opfs_saved_ini_named_parameter_backup_text",
+        await loadTextFile(savedIniNamedParameters.backupOpfsPath),
+        [
+          "5161 31.25",
+          "5162 62.5",
+          "5221 4.5",
+          "5399 99",
+        ].join("\n"),
+      );
       verifyExpectedOutput(
         "opfs_load_ini_named_tool_table",
         loadedIniFileSession.toolTable.result,