- Add GameConfig with initialBallSpeed (220px/s), speedIncrement (18px/s), paddleSpeed (400px/s)
- Add Physics.serveBall(): centers ball, sets random angle (-45 to +45 deg), random left/right dir
- Replace Physics.update() skeleton with full ball movement and wall bounce logic
- Add Physics._checkPaddleCollision() with 5-zone angle deflection and speed increment per hit
- Ball exits left/right bounds → immediate re-serve from center
- Ball pushed out of paddle on collision to prevent double-hit next frame
- Add on-canvas speed debug display (Phase 1 verification aid)
- Created index.html with valid HTML5 structure and black full-window canvas
- Renderer object with devicePixelRatio-aware resize() using logical vs bitmap coords
- CSS enforces overflow:hidden with no scrollbars
- Minimum 4:3 aspect ratio enforcement in resize logic
- window.addEventListener('resize') handler for live canvas rescaling
