支持真实G代码程序执行

结论：AXIS 风格浏览器仿真页面新增 Open Program、runProgramText 和 loadProgramFile，支持用户提供的 G-code 文本/文件通过 LinuxCNC WASM 执行并参与回放。

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

@@ -56,6 +56,7 @@ 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;
 - canonical output rendering;
 - program-line rendering;
 - motion table;
@@ -125,6 +126,8 @@ Current implemented regions:
 
 ### Phase 2: Program Execution Workflow
 
+Status: active; custom text/file execution is implemented.
+
 Upgrade the G-code pane and execution controls:
 
 - load a selected built-in test program;
@@ -133,6 +136,8 @@ Upgrade the G-code pane and execution controls:
   buttons;
 - highlight active G-code line and current motion row;
 - show run status, source program, motion count, and current frame.
+- load operator-provided G-code text through `runProgramText()`;
+- load browser `File` objects through `loadProgramFile()`;
 
 Built-in test programs must live in:
 
@@ -224,6 +229,8 @@ Required methods:
 - `play()`;
 - `pause()`;
 - `finishPlayback()`;
+- `runProgramText(programText, metadata)`;
+- `loadProgramFile(file)`;
 - future: `loadProgramText(text, metadata)`;
 - future: `loadMachineSessionFromOpfs(options)`;
 - future: `getMachineReadiness()`;