参考所有分组，完成尽量多的内容。禁止顺手扩功能 smoke：锁定kinematics源码锚点

docs/linuxcnc-kinematics-source-map.md

@@ -22,6 +22,18 @@ groups:
 | `asset` | 122 | LinuxCNC INI-adjacent HAL, README, GUI, demo, PYVCP, and other source assets. |
 | `tooldata` | 10 | LinuxCNC tool table files referenced by covered M428/M429/M430 INI files. |
 
+## LinuxCNC Source Anchors
+
+- `src/emc/kinematics/Submakefile` defines the kinematics build source surface,
+  including `GENSERKINSSRCS`.
+- `src/emc/kinematics/kinematics.h` declares `kinematicsInverse()` and
+  `kinematicsSwitch()` for switchkins-capable modules.
+- `configs/sim/axis/vismach/5axis/bridgemill/5axis.ini` wires
+  `motion.switchkins-type` and representative M428/M429/M430 switchkins
+  configuration.
+- `configs/sim/axis/vismach/5axis/bridgemill/remap_subs/428remap.ngc`
+  provides a representative `#<kinstype>` remap assignment.
+
 ## Boundaries
 
 - `asset`, `metadata`, `header`, and `tooldata` entries are source coverage,