- Replace hard-capped difficulty curves with exponential ramp function
that continues scaling deep into endless play without plateauing
- Reduce base speeds and shot counts for more deliberate gameplay
- Increase flipper, fuseball, and pulsar speeds for more pressure
- Flipper AI now chains hops toward the claw instead of resting,
making it a true pursuer rather than a shuffler
- Change zapper to refill +1 per level instead of full reset, making
charge management meaningful
- Death no longer resets the board: only enemies within threshold t
die with the player, others remain mid-climb
- Improve enemy shot hit detection with lane distance check instead
of exact lane match
- Add advanceShots() helper for cleaner shot advancement logic
- Update verification tests for new mechanics and difficulty curves
- Add michael background sprites and update tetrisattack characters
