The Sun's catalogue id is 0, and the readout's keep control was shown by `@if (keepableStarId(); as starId)` — which reads zero as "there is no star here". Of the six hundred and thirty-four systems the map can be inside, the one nobody could keep was Sol. Checked against null now, with a test that keeps star zero, because this is the sort of thing that comes back. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016jxMkwA2rbicdGxHosecYi