Fix agent output validation to prevent false verified status (#807)

* Changes from fix/cursor-fix

* feat: Enhance provider error messages with diagnostic context, address test failure, fix port change, move playwright tests to different port

* Update apps/ui/src/components/views/board-view/dialogs/add-feature-dialog.tsx

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

* ci: Update test server port from 3008 to 3108 and add environment configuration

* fix: Correct typo in health endpoint URL and standardize port env vars

---------

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

apps/server/tests/unit/providers/cursor-provider.test.ts

@@ -1,4 +1,4 @@
-import { describe, it, expect } from 'vitest';
+import { describe, it, expect, beforeEach } from 'vitest';
 import { CursorProvider } from '@/providers/cursor-provider.js';
 
 describe('cursor-provider.ts', () => {
@@ -36,4 +36,122 @@ describe('cursor-provider.ts', () => {
       expect(args).not.toContain('--resume');
     });
   });
+
+  describe('normalizeEvent - result error handling', () => {
+    let provider: CursorProvider;
+
+    beforeEach(() => {
+      provider = Object.create(CursorProvider.prototype) as CursorProvider;
+    });
+
+    it('returns error message from resultEvent.error when is_error=true', () => {
+      const event = {
+        type: 'result',
+        is_error: true,
+        error: 'Rate limit exceeded',
+        result: '',
+        subtype: 'error',
+        duration_ms: 3000,
+        session_id: 'sess-123',
+      };
+
+      const msg = provider.normalizeEvent(event);
+
+      expect(msg).not.toBeNull();
+      expect(msg!.type).toBe('error');
+      expect(msg!.error).toBe('Rate limit exceeded');
+    });
+
+    it('falls back to resultEvent.result when error field is empty and is_error=true', () => {
+      const event = {
+        type: 'result',
+        is_error: true,
+        error: '',
+        result: 'Process terminated unexpectedly',
+        subtype: 'error',
+        duration_ms: 5000,
+        session_id: 'sess-456',
+      };
+
+      const msg = provider.normalizeEvent(event);
+
+      expect(msg).not.toBeNull();
+      expect(msg!.type).toBe('error');
+      expect(msg!.error).toBe('Process terminated unexpectedly');
+    });
+
+    it('builds diagnostic fallback when both error and result are empty and is_error=true', () => {
+      const event = {
+        type: 'result',
+        is_error: true,
+        error: '',
+        result: '',
+        subtype: 'error',
+        duration_ms: 5000,
+        session_id: 'sess-789',
+      };
+
+      const msg = provider.normalizeEvent(event);
+
+      expect(msg).not.toBeNull();
+      expect(msg!.type).toBe('error');
+      // Should contain diagnostic info rather than 'Unknown error'
+      expect(msg!.error).toContain('5000ms');
+      expect(msg!.error).toContain('sess-789');
+      expect(msg!.error).not.toBe('Unknown error');
+    });
+
+    it('preserves session_id in error message', () => {
+      const event = {
+        type: 'result',
+        is_error: true,
+        error: 'Timeout occurred',
+        result: '',
+        subtype: 'error',
+        duration_ms: 30000,
+        session_id: 'my-session-id',
+      };
+
+      const msg = provider.normalizeEvent(event);
+
+      expect(msg!.session_id).toBe('my-session-id');
+    });
+
+    it('uses "none" when session_id is missing from diagnostic fallback', () => {
+      const event = {
+        type: 'result',
+        is_error: true,
+        error: '',
+        result: '',
+        subtype: 'error',
+        duration_ms: 5000,
+        // session_id intentionally omitted
+      };
+
+      const msg = provider.normalizeEvent(event);
+
+      expect(msg).not.toBeNull();
+      expect(msg!.type).toBe('error');
+      expect(msg!.error).toContain('none');
+      expect(msg!.error).not.toContain('undefined');
+    });
+
+    it('returns success result when is_error=false', () => {
+      const event = {
+        type: 'result',
+        is_error: false,
+        error: '',
+        result: 'Completed successfully',
+        subtype: 'success',
+        duration_ms: 2000,
+        session_id: 'sess-ok',
+      };
+
+      const msg = provider.normalizeEvent(event);
+
+      expect(msg).not.toBeNull();
+      expect(msg!.type).toBe('result');
+      expect(msg!.subtype).toBe('success');
+    });
+  });
 });