Implement per-corner circular convergence for ContourGen corner processing#43

Draft

Copilot wants to merge 6 commits intomasterfrom

copilot/fix-91088e8f-0c27-41ac-82e2-141f8cdc945e

Commits on Sep 5, 2025

Initial plan
Copilot
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Implement circular convergence algorithm for ContourGen with large radius detection

Copilot
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philstopford
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Add visual demonstration and finalize circular convergence solution

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philstopford
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Implement per-corner circular convergence as clarified by @philstopford

Copilot
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philstopford
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Update tests and fix circular arc calculation for per-corner convergence

Copilot
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philstopford
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Fix circular arc generation to use constrained radius for proper corner rounding

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philstopford
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