完成L4-USER-M-PROCESS Web仿真接入

结论：L4-USER-M-PROCESS 已按 Web/virtual HAL 数控仿真主线完成接入，native LinuxCNC runtime 不再作为 Web 仿真阻塞；新增 text31.txt 接续剩余 77 个 SKIP 的 main-program promotion 复核。

wasm-port/docs/full-process-boundary-design.md

@@ -157,11 +157,28 @@ enabled with `ENABLE_MILLTURN_USER_M_RUNTIME_PROBE=1`, it starts the vendored
 `millturn.ini`, runs the LinuxCNC-owned Tcl `M128`/`M129` scripts, and verifies
 the resulting `ini.[xyz].*` HAL state targets before reporting
 `runtime_state_probe_passed`.
+If another LinuxCNC runtime is already active, the probe reports
+`millturn_user_m_runtime_probe_status=blocked_existing_linuxcnc_runtime` and
+`millturn_user_m_missing_requirements=exclusive_linuxcnc_runtime` instead of
+terminating or taking over that process graph. The current workstation has
+shown that state with an existing `linuxcncsvr -ini .../axis.ini` and
+`rtapi_app load tpmod`.
 
 The artifact keeps `execution_enabled=0` and `promotion_allowed=0`. It is not
 a standalone Tcl/HAL executor and does not make `millturn` a Node/browser
 representative.
 
+The Web/browser simulation side now has a separate source-derived virtual HAL
+proof for the same millturn state transitions. `runRealBrowserSimulation()`
+exposes `millturnUserMProcess` with `M429 -> M129` turn and `M428 -> M128`
+mill transitions, switchkins guard pins, and `ini.[xz].*` limit pin values.
+Node smoke and the real browser simulation page smoke assert that proof while
+keeping `webSimulationReady=true`, `nativeRuntimeRequired=false`,
+`processExecutionReady=false`, `executionEnabled=false`, and
+`promotionAllowed=false`. This completes the browser simulation proof without a
+native LinuxCNC runtime dependency. It still does not execute arbitrary external
+user-M processes or unlock inventory promotion.
+
 `linuxcnc_millturn_user_m_boundary_probe` is the current native guard for this
 evidence. It reads the LinuxCNC source `millturn.ini`, `mcodes/M128`,
 `mcodes/M129`, and the `428remap`/`429remap` callers, then verifies the