Fixes applied and verified (Hermies Qwen, RC-0D193E):
- Rubber band no longer tracks the bird after launch (bug #14, renderer.js)
- Launch direction fixed: toWorld divides by camera zoom (bug #15, main.js)
- Balance retune: stone hp 3400->1400, dmgFactor 0.35->0.8, plus an
enemy-hit damage floor so soft lobs still kill (core.js)
- New test/balance.test.mjs: RED on pre-fix constants, GREEN after
Suite: 27/27 headless + 10/10 real-browser (real mouse events, real canvas).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
ee0c4f942a