feat(content): add action unlock condition schema

src/content/__tests__/schema.test.ts

@@ -97,3 +97,30 @@ describe('costs and multi-yield', () => {
     expect(content.actionsById.forage.costs).toEqual([]);
   });
 });
+
+describe('unlock conditions', () => {
+  it('accepts optional minResources and requireStoryFlags', () => {
+    const actions = [
+      {
+        id: 'forage',
+        name: 'Forage',
+        durationMs: 3000,
+        yields: [{ resourceId: 'gold', amount: 1 }],
+        unlock: {
+          minResources: { gold: 10 },
+          requireStoryFlags: ['intro_complete'],
+        },
+      },
+    ];
+    const content = buildContent({ resources: validResources, actions });
+    expect(content.actionsById.forage.unlock).toEqual({
+      minResources: { gold: 10 },
+      requireStoryFlags: ['intro_complete'],
+    });
+  });
+
+  it('defaults unlock to undefined when omitted', () => {
+    const content = buildContent({ resources: validResources, actions: validActions });
+    expect(content.actionsById.forage.unlock).toBeUndefined();
+  });
+});