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.

components/ecaz-ambassadors.tsx

@@ -23,7 +23,7 @@ import { TERRITORIES } from '@/game/board';
 import { faction } from '@/game/catalog';
 
 export const AMBASSADOR_COVERAGE =
-  'Development coverage: Ambassador placement, Ecaz’s direct Duke acquisition, Emperor, Atreides, Harkonnen, CHOAM, Ixian, Richese, Fremen and Guild entry effects are supported, plus Bene Gesserit copies of those eight ordinary effects. Ecaz alliance and loan choices, other effects and some competing arrival reactions remain unfinished; full Ecaz starts remain disabled.';
+  'Development coverage: Ambassador placement, Ecaz’s direct Duke acquisition and consensual alliance, Emperor, Atreides, Harkonnen, CHOAM, Ixian, Richese, Fremen and Guild entry effects are supported, plus Bene Gesserit copies of those eight ordinary effects. Duke loan choices, other effects and some competing arrival reactions remain unfinished; full Ecaz starts remain disabled.';
 function tokenLocation(token: AmbassadorToken) {
   if (token.zone === 'placed')
     return `Placed in ${TERRITORIES.find((t) => t.id === token.location)?.name ?? 'a stronghold'}`;