Milestone 1 (prototype).
- Place/drag planets on a canvas; N-body gravity with stable integrator
- One level with a goal zone: keep a probe in a target orbit for 10s
- Pause/rewind scrubber
- Exit: playable in-browser with 1 level
Owner: Fenster
Related to #66862
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Milestone 1 (prototype).
Owner: Fenster
Related to #66862