The game now ends each frame with FramerateLimiter.limitDisplayFPS below
260 fps (sleep, overshoot averaging, spin-wait) instead of waking the event
loop at a computed deadline, and the limiter honours Thread.interrupted.
tools/test_frame_limiter_parity.py runs the real limiter bytecode with its
clock calls rewritten to a scripted virtual clock (5,288 cases).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Ludovic Marie