debug_vertex_run_starts exposes the anchor scan's candidate list: Stage_S01 has 15710 stride-24 starts and all three capture-proven offsets (0x3c55d8 twin, 0x40e418 bridge, 0x44a32c eng_02_l) are among them. anchor_pool_mesh takes the first that validates, so an earlier lookalike wins. Scoped to the current decoder's e106 cases; does not overturn the residual-51 finding. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>