test(core): add proper assertion for flags context in error events

The test for copyFlagsFromScopeToEvent was not actually verifying that
the flags were copied to the event. Since the function mutates and returns
the same event object, checking result === event is trivially true.

Added assertion to verify event.contexts.flags contains the expected flags.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: cursoragent

packages/core/test/lib/utils/featureFlags.test.ts

@@ -164,8 +164,13 @@ describe('flags', () => {
 
       const result = _INTERNAL_copyFlagsFromScopeToEvent(event);
 
-      expect(result).toEqual(event);
       expect(getCurrentScope).toHaveBeenCalled();
+      expect(result.contexts?.flags).toEqual({
+        values: [
+          { flag: 'feat1', result: true },
+          { flag: 'feat2', result: false },
+        ],
+      });
     });
   });
 });