Render explosion particles after the asteroid that spawned them dies (SLOP-451)

[tosfos]

Summary

• Explosion particles were stored on each asteroid's own particle system and only drawn from Asteroid.draw(), but a destroyed asteroid is removed from the game state in the same collision tick as explode(). Result: the advertised explosion effect was dead code - asteroids just vanished when shot.
• Destroyed asteroids now hand their still-alive particle system to a game-level explosions list, which keeps updating and drawing it until all particles fade out (and clears on restart).

Evidence

Verified empirically with a headless harness driving the real game classes (pygame-ce 2.5.8, Python 3.14):

• Before: destroyed asteroid received 0 draw calls across 31 subsequent frames; its 60 explosion particles could never be rendered.
• After: the detached system is tracked in game state, drawn every frame (124 draw calls over 31 frames), with particles decaying as intended.

Test plan

• Harness: detached explosion system updates/draws post-impact until empty
• python -m py_compile on all modules

[coderabbitai]

Important

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