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simplifyStroke reduces a stroke's points via Ramer–Douglas–Peucker at a normalized perpendicular-distance tolerance: a fast Surface-Pen stroke drops hundreds of near-collinear samples with no visible change, shrinking the DB row and speeding re-rasterization (R1/R10). Endpoints + significant vertices kept; pressure/tilt + color/width/tool/id preserved; <=2 points or tol<=0 are no-ops (returns the same instance). The commit path can call it before saveHost; the live in-progress stroke stays untouched. Pure geometry over EditorStroke; fully unit-tested (collinear collapse, peak retention, within-tolerance drop, metadata preservation). flutter analyze lib/editor clean; 198/198 tests (+7). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>