test(ocaml-globe): add 22 new tests across math, raycast, color
math: 8 → 19 tests (scale, negate, zero, length, normalize_zero,
cross anticommutativity, rotate_x, rotate_y, look_at,
to_float_array, multiply non-trivial)
raycast: 15 → 22 tests (det3 identity/singular/known, large sphere,
pick threshold, invert perspective/look_at roundtrip)
color: 5 → 9 tests (rgb, named presets, probability boundary,
palette distinct)
Also: fix root dune-project lang 3.20 → 3.21.
81 native tests passing.
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