Records the full mech-subsystem hierarchy discovered while reconstructing the
roster, with per-class build status. 6 classes done + verified (MechSubsystem,
HeatableSubsystem, HeatSink, PoweredSubsystem, Sensor, Generator); the tree shows
the remaining intermediates (HeatWatcher : MechSubsystem, PowerWatcher :
HeatWatcher) that unblock the Torso/HUD/Gyroscope branch (the Mech's directly-
referenced subsystems), plus Myomers/Condenser leaves and the separate weapon
subtree. The reconstruction pattern is now a proven template (documented). Enables
efficient continuation.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>