refactor: move execution limits from engine core to layer

Remove max_execution_time and max_execution_steps from ExecutionContext and GraphEngine since these limits are now handled by ExecutionLimitsLayer. This follows the separation of concerns principle by keeping execution limits as a cross-cutting concern handled by layers rather than embedded in core engine components.

Changes:
- Remove max_execution_time and max_execution_steps from ExecutionContext
- Remove these parameters from GraphEngine.__init__()
- Remove max_execution_time from Dispatcher
- Update workflow_entry.py to no longer pass these parameters
- Update all tests to remove these parameters

api/tests/unit_tests/core/workflow/graph_engine/test_command_system.py

@@ -52,8 +52,6 @@ def test_abort_command():
         graph=mock_graph,
         graph_config={},
         graph_runtime_state=shared_runtime_state,  # Use shared instance
-        max_execution_steps=100,
-        max_execution_time=10,
         command_channel=command_channel,
     )
 

api/tests/unit_tests/core/workflow/graph_engine/test_conditional_streaming_vs_template_workflow.py

@@ -55,8 +55,6 @@ def test_streaming_output_with_blocking_equals_one():
         graph=graph,
         graph_config=graph_config,
         graph_runtime_state=graph_runtime_state,
-        max_execution_steps=500,
-        max_execution_time=30,
         command_channel=InMemoryChannel(),
     )
 
@@ -162,8 +160,6 @@ def test_streaming_output_with_blocking_not_equals_one():
         graph=graph,
         graph_config=graph_config,
         graph_runtime_state=graph_runtime_state,
-        max_execution_steps=500,
-        max_execution_time=30,
         command_channel=InMemoryChannel(),
     )
 

api/tests/unit_tests/core/workflow/graph_engine/test_graph_engine.py

@@ -470,8 +470,6 @@ def test_layer_system_basic():
         graph=graph,
         graph_config=fixture_data.get("workflow", {}).get("graph", {}),
         graph_runtime_state=graph_runtime_state,
-        max_execution_steps=300,
-        max_execution_time=60,
         command_channel=InMemoryChannel(),
     )
 
@@ -535,8 +533,6 @@ def test_layer_chaining():
         graph=graph,
         graph_config=fixture_data.get("workflow", {}).get("graph", {}),
         graph_runtime_state=graph_runtime_state,
-        max_execution_steps=300,
-        max_execution_time=60,
         command_channel=InMemoryChannel(),
     )
 
@@ -591,8 +587,6 @@ def test_layer_error_handling():
         graph=graph,
         graph_config=fixture_data.get("workflow", {}).get("graph", {}),
         graph_runtime_state=graph_runtime_state,
-        max_execution_steps=300,
-        max_execution_time=60,
         command_channel=InMemoryChannel(),
     )
 

api/tests/unit_tests/core/workflow/graph_engine/test_mock_nodes.py

@@ -625,8 +625,6 @@ class MockIterationNode(MockNodeMixin, IterationNode):
             graph=iteration_graph,
             graph_config=self.graph_config,
             graph_runtime_state=graph_runtime_state_copy,
-            max_execution_steps=10000,  # Use default or config value
-            max_execution_time=600,  # Use default or config value
             command_channel=InMemoryChannel(),  # Use InMemoryChannel for sub-graphs
         )
 
@@ -695,8 +693,6 @@ class MockLoopNode(MockNodeMixin, LoopNode):
             graph=loop_graph,
             graph_config=self.graph_config,
             graph_runtime_state=graph_runtime_state_copy,
-            max_execution_steps=10000,  # Use default or config value
-            max_execution_time=600,  # Use default or config value
             command_channel=InMemoryChannel(),  # Use InMemoryChannel for sub-graphs
         )
 

api/tests/unit_tests/core/workflow/graph_engine/test_parallel_streaming_workflow.py

@@ -128,8 +128,6 @@ def test_parallel_streaming_workflow():
         graph=graph,
         graph_config=graph_config,
         graph_runtime_state=graph_runtime_state,
-        max_execution_steps=500,
-        max_execution_time=30,
         command_channel=InMemoryChannel(),
     )
 

api/tests/unit_tests/core/workflow/graph_engine/test_table_runner.py

@@ -388,8 +388,6 @@ class TableTestRunner:
                 graph=graph,
                 graph_config=graph_config,
                 graph_runtime_state=graph_runtime_state,
-                max_execution_steps=500,
-                max_execution_time=int(test_case.timeout),
                 command_channel=InMemoryChannel(),
                 min_workers=self.graph_engine_min_workers,
                 max_workers=self.graph_engine_max_workers,

api/tests/unit_tests/core/workflow/graph_engine/test_tool_in_chatflow.py

@@ -38,8 +38,6 @@ def test_tool_in_chatflow():
         graph=graph,
         graph_config=graph_config,
         graph_runtime_state=graph_runtime_state,
-        max_execution_steps=500,
-        max_execution_time=30,
         command_channel=InMemoryChannel(),
     )