Fix vertex loss in transformation for all-letter-ending node groups#189

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webdevred wants to merge 3 commits intomasterfrom

fix-omap1-vertex-loss

Commits on Apr 9, 2026

Fix vertex loss in transformation for all-letter-ending node groups
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Add OMap1.insertWith and use it to eliminate duplicated merge logic
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Commits on Apr 10, 2026

Rename z-sorting-threshold to y-sorting-threshold
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