接入 WASM blocker 自检

结论：native/source-link 必跑入口已执行 blocker 分析器负路径自检，防止坏 manifest、缺失源根、重复条目和缺失替换映射退化。

docs/linuxcnc-wasm-blockers-source-map.md

@@ -74,6 +74,10 @@ Required tracked core examples:
 - `test-native.sh`, `test-linuxcnc-source-link.sh`, and `build-wasm.sh` must
   run `./check-linuxcnc-wasm-blockers-source-map.sh` before consuming blocker
   analyzer output, source-linked LinuxCNC objects, or browser artifacts.
+- `test-native.sh` and `test-linuxcnc-source-link.sh` must run
+  `test-linuxcnc-wasm-blockers.sh` with `CNC_SIM_WASM_BLOCKERS_SELF_CHECKS=1`
+  so bad manifests, missing LinuxCNC roots, duplicate entries, and missing
+  blocked-source replacements stay executable failures.
 - The WASM blockers source-map guard validates LinuxCNC source/blocker
   ownership and manifest drift only; it does not interpret G-code.