feat(ocaml-globe): add Scene compositor and Color palette
New modules extracted from demo patterns:
Globe.Color — color utilities:
of_hue, palette, of_probability, named presets (ghost, cyan, etc.)
Globe_webgl.Scene — scene compositor:
Canvas/GL setup, resize handler, camera init (v)
Per-frame matrix computation (begin_frame)
Layer compositing in correct order (draw):
stars → earth → grid → orbits → coverage
With visibility flags and rendering params (layers record)
Demo rewritten to use Scene API — no more GL boilerplate, correct
compositing order guaranteed by the library.
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