Add the OverlayNG noding substrate (phase 1): exact noded arrangements with symbolic nodes#442

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Commits on Jul 16, 2026

Add OverlayNG noding-substrate design doc

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Add `rk_compare_along_segment` and node-ordering kernel substrate

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Add the OverlayNG noding substrate (phase 1)

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Add OverlayNG noding-substrate tests

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Skip node-identity compaction when no coincidences merge

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Use plain backticks instead of `@ref` in internal noding docstrings

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