Replace V1.1a page with current verified ladder; add corrections

Audited 2026-07 update: corrected benchmark board (V1 = 85.3%), Seed V2 family scorecard (Base 88.8 / Pro 27B 87.4 / Flash 85.3 / Nano 67.0, honest CANDIDATE statuses), v1.1a withdrawn (malformed packages, scores void), recommended tag -> :v1

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