11dd79425e
Investigate HTML5 Canvas game loop, HiDPI rendering, keyboard input handling, ball physics, and collision detection patterns for Phase 1 Foundation. Document standard stack (vanilla JS + requestAnimationFrame + delta-time physics), architecture patterns (game loop, HiDPI scaling, responsive canvas, input state tracking, AABB collision, physics updates), common pitfalls (tunneling, frame-rate dependency, blur on HiDPI, input lag, aspect ratio bugs, floating point drift), and validation approach (manual visual testing on Retina/120Hz displays). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>