Add shader examples for math functions
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The change
Resolves #8777 (Calculation batch) Changes: Adds inline p5.strands examples to the reference documentation for 13 calculation functions in src/math/calculation.js: • abs() — mirror/fold effect using abs(sin(t)) • ceil() — stepped color bands • floor() — posterized banding effect • fract() — repeating gradient pattern • sqrt() — smooth easing curve • pow() — gamma curve effect • exp() — accelerating brightness • log() — decelerating color transition • min() — maximum brightness clamp • max() — minimum brightness clamp • round() — quantized posterized colors • lerp() — color blending (maps to GLSL mix) • map() — remapped time to color Each example uses buildColorShader() with finalColor.begin()/end() and includes a brief explanation that the function can be used in shaders with p5.strands. Screenshots of the change: <!-- If applicable, add screenshots depicting the changes. --> PR Checklist <!-- To check any option, replace the "○" with a "✓". Be sure to check out how it looks in the Preview tab! Feel free to remove any portion of the template that is not relevant for your issue. --> • ✓ npm run lint passes • ✓ [Inline reference] is included / updated • ○ [Unit tests] are included / updated [Inline reference]: https://p5js.org/contribute/contributing_to_the_p5js_reference/ [Unit tests]: https://github.com/processing/p5.js/tree/main/contributor_docs#unit-tests