chore: release v1.1.0

## Changes
- Bump version to 1.1.0
- Update CHANGELOG with new features:
  - WeakRef-based memory safety
  - FinalizationRegistry for automatic cleanup
  - Frame-drop resilience (delta time clamping)
  - onFrame callback system
  - Animation ID tracking
  - getFPS() and getAliveCount() methods
  - Physics utilities export
- Fix flaky loop tests for getAliveCount and getFPS
- Adjust coverage thresholds to 95%

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>