Support selected Nexus decks with leader skills

docs/RULE_DECISIONS.md

@@ -1,5 +1,11 @@
 # Rule decision index
 
+## Selected Nexus with Leader Skills — 29 October 2026
+
+Selecting Nexus and Leader Skills with expansion decks does not require every
+selected family to be seated or independent Ecaz cards. Existing capture and
+optional-module boundaries remain. [Scope](LEADER_SKILLS_RUNTIME.md#selected-nexus-with-unused-families--29-october-2026).
+
 ## Selected decks with Nexus or Discovery — 29 October 2026
 
 Selecting an expansion deck does not require seating its faction or enabling