拆分仿真测试程序目录

结论：将内置 G-code 测试程序从 simulation-app.js 移入 runtime/ui/simulation/programs/，建立一程序一模块的目录化程序库，并保持页面 API 与验证 gate 兼容。

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

@@ -55,7 +55,7 @@ Browser JavaScript must not implement:
 The current simulation page already has:
 
 - LinuxCNC interpreter WASM execution through `createLinuxCncInterpSdk()`;
-- selectable test programs;
+- selectable test programs under `runtime/ui/simulation/programs/`;
 - canonical output rendering;
 - program-line rendering;
 - motion table;
@@ -134,6 +134,17 @@ Upgrade the G-code pane and execution controls:
 - highlight active G-code line and current motion row;
 - show run status, source program, motion count, and current frame.
 
+Built-in test programs must live in:
+
+```text
+runtime/ui/simulation/programs/
+```
+
+Each program should have its own module and be exported through
+`runtime/ui/simulation/programs/index.js`. The simulation renderer should keep
+importing the inventory through the program index rather than embedding G-code
+fixtures in `simulation-app.js`.
+
 Validation:
 
 - browser smoke runs at least one linear program, one arc program, and one