tc4427: component.models_3d pose record per STEP (Z-up, seated z=0, pad-centre origin, identity binding)
tc4427: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero
tc4427: laser-etched CAD + chip hero (factory 2.0.0 backfill)
tc4427: laser-etched CAD + chip hero (factory 2.0.0 backfill)
tc4427: stamp component.logic (CD4427) from component-ocean
tc4427: backfill missing artifacts (etch, variants)
add validated EAGLE .lbr (Fusion library)
Initial commit: component/tc4427