参考所有分组，完成尽量多的内容：闭环 workstreams source-map 索引

结论：未扩展 smoke 功能行为，仅让 architecture、source-policy 与 workstreams source-map 形成双向索引，并由 check-linuxcnc-workstreams-source-map.sh 守卫。

LinuxCNC 来源依据：configs/sim/axis/vismach/5axis/bridgemill/5axis.ini、remap_subs/428remap.ngc、src/emc/kinematics/Submakefile、kinematics.h、src/emc/rs274ngc/interp_internal.hh、rs274ngc_pre.cc、rs274ngc/Submakefile、tooldata/Submakefile、ini/Submakefile、pythonplugin/Submakefile 的六分组边界。

检查通过：./check-linuxcnc-workstreams-source-map.sh；./check-linuxcnc-build-source-map.sh；./test-native.sh；./test-linuxcnc-source-link.sh；CNC_SIM_ALL_NATIVE_GUARDRAILS_ONLY=1 ./test-all-native.sh。

docs/linuxcnc-source-policy.md

@@ -63,6 +63,9 @@ Efficiency rules:
 - Each pass should advance one reasonable, reviewable context. Do not use a
   nearby failing smoke assertion, broad fixture, or convenient touched file as
   permission to expand the pass into another workstream.
+- Keep the six active workstream contexts synchronized with
+  `docs/linuxcnc-workstreams-source-map.md` so source-map guards, architecture,
+  and this policy stay aligned.
 - Do not add a smoke-only behavior path when the LinuxCNC-backed route already
   exists; add coverage to the source-backed route instead.
 - The legacy explicit smoke backend must not be enabled together with the