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Introduces solitaire_engine::card_animation — a drop-in upgrade over the existing linear CardAnim. Supports MotionCurve easing, parabolic z-lift, scale interpolation, delay, retargeting mid-flight, and per-card timing variation. Coexists with the legacy AnimationPlugin during migration. Also adds .claude/ to .gitignore so Claude Code local tooling is never committed. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>