Announce leaderless Basic battle plans

docs/RULE_DECISIONS.md

@@ -1,5 +1,17 @@
 # Rule decision index
 
+## Basic leaderless battle announcement — 29 October 2026
+
+The [publisher base rulebook, printed p. 10](https://www.gf9games.com/dunegame/wp-content/uploads/Dune-Rulebook.pdf)
+requires a player unable to play a leader or Cheap Hero to announce that fact.
+New Basic leaderless plans now publish the announcement when sealed, using the
+existing Advanced timing, while the rest of the plan stays private. Sealing is
+an online interpretation of the announcement timing; it may occur after the
+other player has already sealed, which remains an open timing limitation. An
+already-sealed Basic plan from an older save is not retroactively announced.
+[Runtime](../tests/basic-leaderless-announcement.test.ts) and
+[controls](../tests/basic-leaderless-announcement-controls.test.tsx).
+
 ## Basic Semuta after Ixian ally replacement with independent cards — 29 October 2026
 
 The existing private Semuta exchange now applies to the discarded card from a