- Import and register new `BootScene` and `MenuScene` in `main.js`.
- Create `BootScene` to generate all shared textures once at startup and then start the menu.
- Implement full-featured `MenuScene` with background asteroids, wandering alien, title, controls panel, and start button (including ENTER key support).
- Remove texture generation logic and helper from `GameScene`; it now relies on textures created by `BootScene`.
- Change game‑over handling to return to the menu instead of restarting the game.
- 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.
Brian Fertig