Expand Basic Richese movement and worm interactions

docs/RICHESE_NO_FIELD_RULES.md

@@ -2,6 +2,18 @@
 
 Audit date: 2026-09-06. This document distinguishes the printed token lifecycle from engine integration and unresolved combinations. It does not certify Richese, Homeworlds, or any other gated game mode.
 
+## Basic foreign-movement interruptions — 29 October 2026
+
+In the supported Basic native Ix/CHOAM roster, Richese may also reveal its
+existing marker while another faction's ordinary movement awaits a Fremen or
+Ixian movement response or a CHOAM movement decision. The original physical
+movement, source and reaction remain pending. Reveal places the available
+forces or removes a zero marker; it does not count as a movement or replay the
+original move. The implementation checks the selected foreign forces and
+retains its existing current-turn Truthtrance and commitment boundaries.
+Special movement parents and other optional modules remain outside this slice.
+This interrupt order is a provisional online interpretation.
+
 ## Basic additional response windows — 29 October 2026
 
 The voluntary before-Battle reveal also works during clean ordinary Emperor