说明virtual HAL仿真提升

结论：补充 virtual HAL 成果对 Web 数控仿真的提升说明，并用 docs smoke 固化关键提升点；baseline 保持 28/28/131/0，Python remap、tool DB、external user-M hard block 未解锁。

wasm-port/runtime/sdk/README.md

@@ -390,6 +390,18 @@ realtime scheduling, external device drivers, native HAL module ABI behavior,
 HALUI process behavior, and Tcl/Python process integration remain explicit
 boundaries.
 
+In practical Web simulation terms, the completed virtual HAL evidence improves
+the system by making HAL/UI/machine-state diagnostics inspectable without host
+LinuxCNC processes. Browser and Node workflows can share one source-derived HAL
+pin/signal/param registry, execute deterministic `halcmd`-style command
+fixtures, advance motion feedback through servo-period stepping, persist
+virtual HAL diagnostics through OPFS/session artifacts, and expose release URL
+workflow evidence for 8 diagnostics-ready promotion candidates across 3
+families and 17 LinuxCNC source files. These are simulation and evidence
+surface improvements only; Python remap runtime, tool DB process protocol,
+external user-M execution, native HAL module ABI behavior, and JavaScript-owned
+CNC semantics remain outside this scope.
+
 ## Project release readiness export
 
 `createProjectReleaseGateManifest()` returns the required release gate IDs,