Added arithmetic safety and unit tests to Plotters Backend#738

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RPG-Alex wants to merge 25 commits intoplotters-rs:masterfrom

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Commits on Apr 24, 2026

Commits on Apr 26, 2026

Made error enum top level as it will apply broadly
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Commits on Apr 27, 2026

Commits on Apr 28, 2026

Commits on May 1, 2026

backend `cicle` maths safety progress
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Commits on May 4, 2026

Made mathguard concrete, no more generics.
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Commits on May 5, 2026