Support staged group Emperor aid

docs/OPTIONAL_ALLIANCE_VICTORY.md

@@ -57,6 +57,20 @@ remaining faction benefits and interactions are not connected. No lobby can
 start a group game yet. The recipient-specific pledge and allocation procedure
 is a provisional online convention rather than a printed worked example.
 
+## Group Emperor aid — 28 October 2026
+
+**Staged Basic prototype, not a selectable game mode.** The Emperor chooses
+which of the two group allies receives a spice gift or paid extra revival.
+The ordinary Karama response retains the selected recipient, and payment and
+revival occur only if that response is passed. A staged table exposes a
+recipient selector; bots can offer legal targeted revivals. The native
+per-recipient allowance is provisionally applied separately to both allies:
+the printed power and [publisher FAQ](https://www.gf9games.com/dune/wp-content/uploads/2020/11/Dune-FAQ-Nov-2020.pdf)
+describe an ally but do not settle a three-member alliance's limit. This is
+an implementation interpretation, not an official ruling. The prototype is
+restricted to Basic classic factions without optional modules; other group
+faction benefits and combinations remain unfinished and no lobby exposes it.
+
 ## Group Nexus negotiation — 28 October 2026
 
 **Integrated groundwork, not a selectable game mode.** In a staged Basic