Records the Mech-ctor segment-walk factory (mech.cpp:1146-1330) with the full
MISLABELED ClassID->real-class map (VDATA enum names differ from the real
classes). 16 roster classes done; 7 remain for a complete walk (Reservoir,
HeatSink-bank, Searchlight, MechTech, ThermalSight, SubsystemMessageManager,
Actuator). Blueprint in MECHSUB.NOTES.md guides phase 4.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>