新增真实G代码编辑区

结论：AXIS 风格浏览器仿真页面新增可编辑 G-code pane、Run Editor Text、get/setProgramText 和 runEditorProgramText，编辑后的真实 G-code 继续通过 LinuxCNC WASM 执行并纳入 browser gate。

wasm-port/docs/axis-style-simulation-implementation.md

@@ -57,6 +57,7 @@ The current simulation page already has:
 - LinuxCNC interpreter WASM execution through `createLinuxCncInterpSdk()`;
 - selectable test programs under `runtime/ui/simulation/programs/`;
 - custom G-code text and browser File execution through LinuxCNC WASM;
+- editable G-code pane plus run-editor-text workflow;
 - canonical output rendering;
 - program-line rendering;
 - motion table;
@@ -126,7 +127,7 @@ Current implemented regions:
 
 ### Phase 2: Program Execution Workflow
 
-Status: active; custom text/file execution is implemented.
+Status: active; custom text/file execution and editor-text execution are implemented.
 
 Upgrade the G-code pane and execution controls:
 
@@ -138,6 +139,8 @@ Upgrade the G-code pane and execution controls:
 - show run status, source program, motion count, and current frame.
 - load operator-provided G-code text through `runProgramText()`;
 - load browser `File` objects through `loadProgramFile()`;
+- edit visible G-code in the AXIS shell and run it through
+  `runEditorProgramText()`;
 
 Built-in test programs must live in:
 
@@ -231,6 +234,9 @@ Required methods:
 - `finishPlayback()`;
 - `runProgramText(programText, metadata)`;
 - `loadProgramFile(file)`;
+- `getProgramText()`;
+- `setProgramText(text, metadata)`;
+- `runEditorProgramText()`;
 - future: `loadProgramText(text, metadata)`;
 - future: `loadMachineSessionFromOpfs(options)`;
 - future: `getMachineReadiness()`;