Implement Homeworld mechanics through Caladan reinforcement checkpoint

Connect typed Homeworld custody, transport, battle, income, revival and Caladan reinforcement flows with private multiplayer recovery and controls. Preserve the optimized test workflow and keep unfinished rules modes gated. Verified with 3682 offline tests, typecheck, lint, production build and 40 HTTP tests; existing saved games remain unchanged.

game/choam-karama.ts

@@ -2,13 +2,15 @@ import type { Game, Player } from './engine';
 import { retentionReservesCard } from './moritani-retention';
 /** Only cards not already fixed into a battle may be converted into spice. */
 export function cashInCards(
-  g: Pick<Game, 'battle' | 'moritaniRetention'>,
+  g: Pick<Game, 'battle' | 'moritaniRetention' | 'pendingWinnerDiscards'>,
   p: Pick<Player, 'id' | 'hand'>,
 ) {
   const plan = g.battle?.plans[p.id];
   const insight = g.battle?.prescience;
   return p.hand.filter(
     (c) =>
+      !(g.pendingWinnerDiscards?.player === p.id &&
+        [...g.pendingWinnerDiscards.cards, ...g.pendingWinnerDiscards.optional].includes(c.id)) &&
       !retentionReservesCard(g, p.id, c.id) &&
       (!plan || ![plan.weapon, plan.defense, plan.leader].includes(c.id)) &&
       (!insight || insight.player === p.id || insight.value !== c.id),