Guard Duke grants using public capture uncertainty

docs/RULE_DECISIONS.md

@@ -1,5 +1,13 @@
 # Rule decision index
 
+## Duke Ambassador capture uncertainty — 29 October 2026
+
+Fresh games record whether a public capture could have involved Duke, without
+using the secret selection. Direct acquisition and automatic alliance loan
+are uniformly guarded while that history is uncertain; legacy games without
+the receipt remain conservative. This is a provisional online policy.
+[Scope](ECAZ_DUKE_ACQUISITION.md#public-capture-uncertainty--29-october-2026).
+
 ## Concealed Duke and Ghola guidance — 29 October 2026
 
 Ecaz's Ghola guidance uses its projected Duke state, matching ordinary revival;