feat: adaptive trail sampling for smoother ribbons with less geometry#46
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feat: adaptive trail sampling for smoother ribbons with less geometry#46
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Replace fixed-interval trail sampling (every 16ms) with direction-aware adaptive sampling. Points are recorded densely on turns (>5.7° direction change) and sparsely on straights (0.5m max / 64ms floor), producing smoother ribbon curves where it matters without wasting buffer on redundant straight-line segments. Halve TRAIL_MAX from 3600 to 1800 since adaptive sampling achieves comparable trail coverage with fewer points, reducing per-vehicle memory and draw cost — significant for multi-vehicle scenarios.
Snow mode was falling through to the Grid default thermal gradient (purple → white) instead of its dedicated palette (navy → blue → teal → green → yellow → red).
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Rebased version of #44 on latest main.