fix: increased timeout for assertion test cases

tests/python/execution/test_distributed_executor.py

@@ -221,7 +221,7 @@ def test_diamond_dag_parallel(self, diamond_dag):
         elapsed = time.monotonic() - start
         assert dist_result.execution_result.succeeded == 4
         # b and c run in parallel, so total should be ~0.2s, not ~0.3s
-        assert elapsed < 0.5
+        assert elapsed < 0.8
 
 
 class TestDistributedExecutionResult:

tests/python/execution/test_executor.py

@@ -121,7 +121,7 @@ def test_parallel_execution(self, diamond_dag):
         elapsed = time.monotonic() - start
         assert result.succeeded == 4
         # Sequential would be ~0.3s, parallel b+c should be ~0.2s
-        assert elapsed < 0.5
+        assert elapsed < 0.8
 
     def test_with_costs(self, diamond_dag):
         tasks = {