§6 polish: clarify Figure 5 (decision_utility) is in Appendix D, not main text

After moving Figure 5 from §6 to Appendix D in v2.23, §6 ¶2 still said
'Figure~\ref{fig:decision_utility} makes the decision value explicit'
which would render as 'Figure 5 makes...' but Figure 5 is now in the
appendix. Reader on p8 looking for Figure 5 nearby would not find it.

Added explicit '(Appendix~\ref{app:all_validations})' parenthetical
right after the figure ref so the reader knows where to look.

Audit of all other figure refs (Figures 1-4 in main text):
- fig:audit_hero (Figure 1, §2) → refs in §1/§2 main text ✓
- fig:temporal_cross_arch (Figure 2, §5) → refs in §3/§5 ✓
- fig:penalty_rescue (Figure 3, §5) → refs in §4/§5/§7 ✓
- fig:cross_arch_summary (Figure 4, §5) → refs in §5/§6 ✓

All clean. Main content still 9 pages.

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