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-entry.tsx

@@ -32,7 +32,9 @@ export function EcazEntry({
     !entry ||
     game.decision?.kind !== 'ecazAmbassador' ||
     game.decision.player !== game.me ||
-    !['offer', 'copy', 'cards', 'move', 'ship'].includes(entry.stage)
+    !['offer', 'allianceReply', 'copy', 'cards', 'move', 'ship'].includes(
+      entry.stage,
+    )
   )
     return null;
   const me = game.players.find((p) => p.id === game.me)!;
@@ -54,6 +56,9 @@ export function EcazEntry({
     (entry.dukeAcquisition
       ? null
       : 'Duke acquisition is unavailable for this opportunity.');
+  const allianceBlock =
+    entry.allianceOffer?.blocked ??
+    (entry.allianceOffer ? null : 'This alliance opportunity is unavailable.');
   const duke = game.dukeVidal?.leader;
   return (
     <section
@@ -107,9 +112,36 @@ export function EcazEntry({
                   {dukeBlock}
                 </p>
               )}
+              <Button
+                className={buttonClass}
+                disabled={busy || !!allianceBlock}
+                aria-describedby={
+                  allianceBlock ? `${id}-alliance-block` : undefined
+                }
+                onClick={() => {
+                  if (!allianceBlock)
+                    send({
+                      trigger: true,
+                      beneficiary: entry.owner,
+                      choice: 'alliance',
+                    });
+                }}
+              >
+                Offer alliance to{' '}
+                {game.players.find((p) => p.id === entry.entrant)?.name}
+              </Button>
+              {allianceBlock && (
+                <p
+                  id={`${id}-alliance-block`}
+                  className="m-0 text-sm leading-6"
+                >
+                  {allianceBlock}
+                </p>
+              )}
               <p className="m-0 text-sm leading-6">
-                Alliance proposals, acquisition for an ally and Duke loans
-                through this Ambassador remain unfinished.
+                Both factions must be unallied. The entrant chooses whether to
+                accept. The triggered Ambassador returns to supply even if the
+                offer is refused. Duke loans remain unfinished.
               </p>
             </>
           ) : (
@@ -157,6 +189,30 @@ export function EcazEntry({
             Leave Ambassador in place
           </Button>
         </>
+      ) : entry.stage === 'allianceReply' ? (
+        <>
+          <p className="m-0 text-sm leading-6">
+            {game.players.find((p) => p.id === entry.owner)?.name} offers you an
+            alliance. Accepting activates both factions’ alliance abilities
+            immediately. Duke Vidal is not included in this offer. Your
+            remaining actions resume after your reply.
+          </p>
+          <Button
+            className={buttonClass}
+            disabled={busy}
+            onClick={() => send({ accept: true })}
+          >
+            Accept alliance
+          </Button>
+          <Button
+            variant="outline"
+            className={buttonClass}
+            disabled={busy}
+            onClick={() => send({ accept: false })}
+          >
+            Refuse alliance
+          </Button>
+        </>
       ) : entry.stage === 'copy' ? (
         <>
           <p className="m-0 text-sm leading-6">