Maxim Dolgolyov 2e7ec81e59 feat: Phase 3 планиметрии — дуги углов, маркер 90°, инструменты foot/circumcircle/incircle ...

- _drawAngleMeasures(): реальные дуги через биссектрису (midAngle±halfSpread),
  маркер правого угла квадратом при |angle-90°|<2°
- gIncircle(): функция вписанной окружности треугольника
- GeoEngine: поддержка constr='foot' (точка), constr='circumcircle'/'incircle' (окружность)
  в _dependsOn и recompute; cascadeDelete через derived circles
- _drawCircle(): обработка derived=true (circumcircle/incircle) — dashed + cx/cy/r
- getStats(): исправлена статистика для производных окружностей
- constructions учитывает derivedCircles
- lab.html: 3 новые кнопки (Основание, Описанная, Вписанная) + хинты

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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