Add CLAUDE.md with architecture overview and dev commands for future
Claude Code sessions. Update README with tech stack, project structure,
and how-to-play instructions. Add spec for fixing collision physics
tuning issues.
Browser-based physics puzzle game where players drop fruits that merge
into larger fruits on collision, using Matter.js for 2D physics and
Canvas2D for rendering. Includes 11-fruit progression chain, scoring,
game-over detection, mouse/touch input, and Vitest test suite.
