Moving eight parts to the base-board bottom for single-sided JLC SMT meant freezing the pad positions and sides of every mating header, comparing all 39 mating pads against the previous build, and gating the built placement side against the exported CPL with negative tests.
From the Grok pain-radar digests, Nov 1-2 2026 (Nov 1 8:41 AM ET through Nov 2 7:41 AM ET digests plus the Haitch editions). Verified live 2026-11-02: issue/PR read; title and state confirmed.