Expand Basic Richese movement and worm interactions

docs/SEMUTA_SOURCE_UPDATE_20260907.md

@@ -1,5 +1,16 @@
 # Semuta Drug source update and implementation boundary
 
+## Basic Ambassador discards during a worm ride — 29 October 2026
+
+**Prototyped / Partial.** A native Fremen worm ride into a CHOAM or Ixian
+Ambassador, including a Bene Gesserit copy, can now offer the original private
+discard group to Semuta. CHOAM's credit remains committed; an Ixian replacement
+is drawn once after the reaction. The original ride and remaining Spice Blow
+queue resume once, with the queue bound to the saved discard continuation.
+This covers the clean Basic profile; overlapping Terror, summoned worms and
+other parent interactions remain guarded. The ordering is an online
+interpretation of the printed fresh-discard timing, not a new publisher ruling.
+
 ## Public Richese Homeworld entry — 29 October 2026
 
 **Prototyped / Partial.** Fresh public Basic and Advanced games with Richese,