xfy c2d4bf779a docs: add Interstellar black hole renderer design spec ...

Analyzes reference video (BH + tilted Doppler disk + lensed halo + stars),
specifies full 8-feature scope (adds cubemap skybox, lensed planets, Flamm
grid), Schwarzschild Phase 1 with Kerr Phase 2 follow-up, Bevy 0.19
full-screen Material2d architecture.

2026-07-09 18:20:38 +08:00

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2026-07-09-interstellar-blackhole-design.md

docs: add Interstellar black hole renderer design spec

2026-07-09 18:20:38 +08:00