Pilot hand geometry attribution

The hands are extracted from F15/Models/pilot.ac, part of the official FlightGear F-15 source package by Richard Harrison and contributors. Distribution is GPL-2.0-or-later under the FGAddon provenance recorded in SOURCE_MANIFEST.json and F15/LICENSE-NOTE.txt. The source package does not identify a separate author for these individual hand meshes.

Original objects: LR-hand (right hand, including LR-wrist) and LL-glove (left hand). The extraction retains original mesh geometry, translates it to a hand-local origin, and applies explicit runtime pose/color/sleeve adaptations. This is a shared pilot hand asset, not a claim that every aircraft's original cockpit supplied these hands.

PILOT_HANDS_SOURCE.json records source bounds, original object names and translation centers. The exact original pilot.ac and its package notices are included in F15-source.tar.gz. convert_pilot_hands.py, pilot-hands.mjs and CONTROL_GRIPS.json are included in the separately published conversion-toolchain.zip.
