- Added `warpOut()` to `AlienShip` with spin‑shrink animation and black‑hole ring visual.
- Modified `spawnAlienBullet` to pass the firing ship to `Bullet`.
- Extended `Bullet` constructor with `ownerEntity` to store the originating `AlienShip`.
- Updated collision callbacks in `GameScene` to trigger `warpOut()` on the owning ship when its bullet hits the player or when the player collides with an alien, and to remove the ship from the alien list.
- Fixed overlap order for alien bullets vs. player.
These changes give alien ships a dramatic disappearance animation and ensure proper cleanup after collisions.