feat(content): add action costs and multi-yield schema

src/engine/__tests__/determinism.test.ts

@@ -11,7 +11,7 @@ function testContent() {
         id: 'forage',
         name: 'Forage',
         durationMs: 300,
-        yields: { resourceId: 'gold', amount: 1 },
+        yields: [{ resourceId: 'gold', amount: 1 }],
       },
     ],
   });

src/engine/__tests__/game.test.ts

@@ -6,7 +6,7 @@ function testContent() {
   return buildContent({
     resources: [{ id: 'gold', name: 'Gold', startAmount: 5 }],
     actions: [
-      { id: 'forage', name: 'Forage', durationMs: 300, yields: { resourceId: 'gold', amount: 2 } },
+      { id: 'forage', name: 'Forage', durationMs: 300, yields: [{ resourceId: 'gold', amount: 2 }] },
     ],
   });
 }

src/engine/__tests__/save.test.ts

@@ -15,7 +15,7 @@ function testContent() {
   return buildContent({
     resources: [{ id: 'gold', name: 'Gold', startAmount: 0 }],
     actions: [
-      { id: 'forage', name: 'Forage', durationMs: 3000, yields: { resourceId: 'gold', amount: 1 } },
+      { id: 'forage', name: 'Forage', durationMs: 3000, yields: [{ resourceId: 'gold', amount: 1 }] },
     ],
   });
 }

src/engine/game.ts

@@ -50,6 +50,8 @@ export function tickGame(state: GameState, content: Content, tickMs: number): vo
   state.actionElapsedMs += tickMs;
   while (state.actionElapsedMs >= action.durationMs) {
     state.actionElapsedMs -= action.durationMs;
-    state.resources[action.yields.resourceId] += action.yields.amount;
+    for (const y of action.yields) {
+      state.resources[y.resourceId] += y.amount;
+    }
   }
 }