- smin_grad is Quilez's quadratic-polynomial smin, not cubic.
- cellular's search radius is 5x5x5 (F6), not 3x3x3; adds the exactness
proof and the pruning claim.
- id source is now pcg4d over the winning cell, not the pcg3d hash that
produced its jitter (F4).
- F2 = 0 is documented as reachable (past |p| of about 2^23), not
unreachable; removes the false "unreachable" claim and adds a "Precision
domain" note stating the float32 feature-spacing/tie behaviour honestly
(F3, minor finding).
- The struct-mirror comparison note now says it also matches field name and
type in declaration order, not just position (F2).
No entry added to THIRD-PARTY-NOTICES for the Quilez/Worley formulas: per
Self's standing ruling, a published formula is not ported code.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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