Support mixed Discovery decks with Leader Skills

docs/RULE_DECISIONS.md

@@ -1,5 +1,11 @@
 # Rule decision index
 
+## Selected Discovery with Leader Skills — 30 October 2026
+
+Discovery and Leader Skills can be selected with mixed expansion decks without
+requiring Nexus or independent Ecaz cards. Existing provisional shared-entry
+order and capture boundaries remain. [Scope](DISCOVERY_PROTOTYPE.md#selected-decks-with-leader-skills--30-october-2026).
+
 ## Human Emperor gift before automated Extortion — 30 October 2026
 
 A human Emperor's automated allied payer waits for an event-bound Continue,