Record board dimensions (7.5in square) and absence of errata sheet

Owner-measured: sector boards are 7.5in to a side (1.5in per space);
no errata sheet in the 6e box. Closes the physical checklist except
the optional counter-sheet inventory.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packages/engine/data/VERIFICATION.md

@@ -51,10 +51,10 @@ each layout appears exactly once; perimeter openings verified on all 24 edges; t
 shipped in the base box (boards unlabeled; art style suggests E+F are the Exp1 pair),
 which layout was replaced before 7e, board backs.
 
-## 📐 Remaining — physical odds and ends
+## ✅ Done — physical odds and ends (owner-reported, 2026-08-15)
 
-- [ ] **Physical dimensions** of a sector board (one photo next to a ruler/tape).
-- [ ] **Errata sheet** — check the box for any loose insert (the 5e shipped one).
+- ~~Physical dimensions~~ — sector boards are **7.5 in to a side** (1.5 in per space).
+- ~~Errata sheet~~ — **none** in the owner's 6e box.
 - [ ] Optional: token/counter-sheet photo (inventory is undocumented; the rulebook
       confirms "two counter sheets" but not their contents).