Support mixed Discovery decks with Leader Skills

docs/DISCOVERY_PROTOTYPE.md

@@ -1,5 +1,21 @@
 # Discovery functional prototype
 
+## Selected decks with Leader Skills — 30 October 2026
+
+**Prototyped / Partial.** Fresh Basic and Advanced previews can combine the
+original Discovery tokens and Leader Skills with selected Ecaz/Moritani,
+Ixians/Tleilaxu and CHOAM/Richese decks without requiring Nexus or independent
+Ecaz cards. Selected families need not all be seated. Original Tech requires
+three seats; Strongholds require Advanced. The native Ecaz/Moritani shared
+arrival retains its provisional storm order. Advanced actual E3/Harkonnen and
+separate Semuta, nested reactions and other interactions remain guarded or
+unfinished. Started games are not converted.
+
+Public-start fixtures train leaders, resolve an actual Discovery blow and the
+shared Ambassador/Terror entry, with controlled unopened Spice order and
+original token placement. These paths do not certify complete games, every
+module interaction or deployed behavior.
+
 ## Selected but unused E3 deck — 29 October 2026
 
 **Prototyped / Partial.** A fresh Basic or Advanced preview can select only