feat(mockups): slot 16 voyage readable; record 14 vs 15 feedback

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/DECISIONS.md

@@ -62,3 +62,7 @@ persistent side panel. No new dependency.
 ## 2026-10-30 — three.js allowed in mockup 15
 
 **Decision:** mockup 15 (Voyage, look 2) may use three.js; it iterates on 14. No new dependency.
+
+## 2026-10-30 — three.js allowed in mockup 16
+
+**Decision:** mockup 16 (Voyage, readable) may use three.js; it iterates on 15. No new dependency.