Add three-member short alliance prototype

docs/CURRENT_STATUS.md

@@ -17,6 +17,16 @@ open mode gates.
 
 ## Current checkpoint and work
 
+**Three-member short alliance option — 29 October. Prototyped / Partial.**
+A distinct staged Basic variant caps alliances at three and gives pairs or
+triples a three-stronghold target; the older four-stronghold and unlimited
+variants retain their own limits. A real Basic setup and Nexus exercise
+consent, projected controls and four minimal bot proposals with only an empty
+ledger staged; pair and triple wins use a separately staged physical board.
+Thirteen related files pass 59 cases; typecheck, lint and build pass. Group play remains unavailable from the
+lobby until its unfinished rules and complete-game gates are met.
+[Scope](OPTIONAL_ALLIANCE_VICTORY.md#three-member-three-stronghold-variant--29-october-2026).
+
 **Sapho ordering of battle Truthtrances — 29 October. Prototyped / Partial.**
 A quiet unrevealed battle can retain its event and plans while simultaneous
 Truthtrance holders use Sapho to reorder their questions. In the supported