Lucas Berger
f700182674
Gate 2 A3 fail: a second member (amelia) got the same color as the first (luc), both #E8734A. Color was assigned by COUNT(*) % palette; a deleted spike user shifted the count so two live members landed on the same slot. Replace with 'first palette color not already in use by another user' (fall back to count round-robin only once the palette is exhausted) — guarantees distinct, stable colors for up to palette length members. +1 regression test (deletion frees a slot → next member fills it, no collision).
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