fix(session-state): previne divisão por zero em getProgressSummary (#537)

Merge: trivial fix, CodeRabbit APPROVED, all Jest tests pass (Node 18-25), Codecov 100%

Author: nikolasdehor

.aios-core/core/orchestration/session-state.js

@@ -618,7 +618,9 @@ O que você quer fazer?
       progress: {
         completed: progress.stories_done.length,
         total: epic.total_stories,
-        percentage: Math.round((progress.stories_done.length / epic.total_stories) * 100),
+        percentage: epic.total_stories > 0
+          ? Math.round((progress.stories_done.length / epic.total_stories) * 100)
+          : 0,
         storiesDone: progress.stories_done,
         storiesPending: progress.stories_pending,
         currentStory: progress.current_story,

tests/core/orchestration/session-state.test.js

@@ -541,6 +541,23 @@ describe('SessionState', () => {
       expect(summary.progress.storiesDone).toEqual(['11.1', '11.2']);
       expect(summary.context.branch).toBe('feature/bob');
     });
+
+    it('should return 0 percentage when totalStories is 0 (no division by zero)', async () => {
+      const epicInfo = {
+        id: 'epic-empty',
+        title: 'Empty Epic',
+        totalStories: 0,
+        storyIds: [],
+      };
+      await sessionState.createSessionState(epicInfo, 'feature/empty');
+
+      const summary = sessionState.getProgressSummary();
+
+      expect(summary.progress.percentage).toBe(0);
+      expect(Number.isNaN(summary.progress.percentage)).toBe(false);
+      expect(summary.progress.total).toBe(0);
+      expect(summary.progress.completed).toBe(0);
+    });
   });
 
   describe('discard()', () => {