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/mobile-stronghold.tsx

@@ -28,6 +28,7 @@ export function MobileStronghold({
 }) {
   const pointer = g.mobileStronghold?.location;
   const placement = !pointer;
+  const blocked = !placement ? g.homeworldMobility?.mobileStrongholdBlocked : null;
   const [destination, setDestination] = useState('polar_sink:0');
   const [route, setRoute] = useState<string[]>(pointer ? [pointer] : []);
   const [collect, setCollect] = useState(true);
@@ -51,11 +52,12 @@ export function MobileStronghold({
   );
   const valid =
     placement ||
-    (route.length > 1 &&
+    (!blocked && route.length > 1 &&
       route.every((key) => splitLocation(key).sector !== g.storm) &&
       territory(splitLocation(current).territory).type !== 'stronghold');
   return (
     <div className="mobile-route">
+      {blocked && <p className="notice">{blocked}</p>}
       <p>
         {placement
           ? 'Point your stronghold at a sector in any non-stronghold territory. Placement does not collect spice.'