feat: workflow graph system — blocks 1-20 complete checkpoint

Full graph-based workflow execution engine with:
- WorkflowGraphRuntime with two-phase dispatch (collect → fire Celery tasks)
- Node registry with contract validation, socket types, execution kinds
- WorkflowRuntimeServices: preflight, context resolution, shadow-mode A/B
- WorkflowRouter: CRUD + dispatch/preflight/run-history API endpoints
- OutputTypeContracts: workflow binding, rollout-mode resolution
- Admin router: output-type workflow binding endpoints
- Frontend: complete workflow editor with drag-drop canvas, node inspector,
  module bundles, reference bundles, preflight panel, validation banner,
  authoring guidance, blueprint templates, shadow/rollout gate UI
- Tests: comprehensive coverage for all workflow modules
- Docs: NODE_CONTRACT_AUDIT and VALIDATION_ERROR_INVENTORY

All 20 blocks from NEXT_20_BLOCK_BATCH_PLAN completed.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/tests/domains/test_workflow_node_registry.py

@@ -3,7 +3,16 @@ import pytest
 from app.core.process_steps import StepName
 from app.domains.rendering.models import OutputType, WorkflowDefinition, WorkflowRun
 from app.domains.rendering.workflow_config_utils import build_preset_workflow_config
-from app.domains.rendering.workflow_graph_runtime import _STILL_TASK_KEYS, _TURNTABLE_TASK_KEYS
+from app.domains.rendering.workflow_graph_runtime import (
+    _AUTO_POPULATE_RUNTIME_KEYS,
+    _GLB_BBOX_RUNTIME_KEYS,
+    _MATERIAL_MAP_RUNTIME_KEYS,
+    _NOTIFY_RUNTIME_KEYS,
+    _OUTPUT_SAVE_RUNTIME_KEYS,
+    _RESOLVE_TEMPLATE_RUNTIME_KEYS,
+    _STILL_TASK_KEYS,
+    _TURNTABLE_TASK_KEYS,
+)
 from app.domains.rendering.workflow_node_registry import (
     get_node_definition,
     list_node_definitions,
@@ -121,6 +130,29 @@ def test_graph_render_node_fields_are_supported_by_runtime_dispatch():
     assert turntable_runtime_fields <= _TURNTABLE_TASK_KEYS
 
 
+def test_bridge_node_fields_match_runtime_dispatch_contracts():
+    resolve_template = get_node_definition(StepName.RESOLVE_TEMPLATE)
+    material_map = get_node_definition(StepName.MATERIAL_MAP_RESOLVE)
+    auto_populate = get_node_definition(StepName.AUTO_POPULATE_MATERIALS)
+    glb_bbox = get_node_definition(StepName.GLB_BBOX)
+    output_save = get_node_definition(StepName.OUTPUT_SAVE)
+    notify = get_node_definition(StepName.NOTIFY)
+
+    assert resolve_template is not None
+    assert material_map is not None
+    assert auto_populate is not None
+    assert glb_bbox is not None
+    assert output_save is not None
+    assert notify is not None
+
+    assert {field.key for field in resolve_template.fields} == _RESOLVE_TEMPLATE_RUNTIME_KEYS
+    assert {field.key for field in material_map.fields} == _MATERIAL_MAP_RUNTIME_KEYS
+    assert {field.key for field in auto_populate.fields} == _AUTO_POPULATE_RUNTIME_KEYS
+    assert {field.key for field in glb_bbox.fields} == _GLB_BBOX_RUNTIME_KEYS
+    assert {field.key for field in output_save.fields} == _OUTPUT_SAVE_RUNTIME_KEYS
+    assert {field.key for field in notify.fields} == _NOTIFY_RUNTIME_KEYS
+
+
 def test_order_line_setup_and_template_contracts_expose_runtime_outputs():
     setup = get_node_definition(StepName.ORDER_LINE_SETUP)
     template = get_node_definition(StepName.RESOLVE_TEMPLATE)
@@ -178,7 +210,13 @@ def test_order_line_setup_and_template_contracts_expose_runtime_outputs():
         "include_populated_products",
     }
     assert output.input_contract["requires"] == ["order_line_context"]
-    assert output.input_contract["requires_any"] == ["rendered_image", "rendered_frames", "rendered_video"]
+    assert output.input_contract["requires_any"] == [
+        "rendered_image",
+        "rendered_frames",
+        "rendered_video",
+        "blend_asset",
+    ]
+    assert "blend_asset" in output.artifact_roles_consumed
     assert set(output.output_contract["provides"]) >= {"media_asset", "workflow_result"}
     assert {field.key for field in output.fields} == {
         "expected_artifact_role",
@@ -193,6 +231,7 @@ def test_order_line_setup_and_template_contracts_expose_runtime_outputs():
         "rendered_frames",
         "rendered_video",
         "workflow_result",
+        "blend_asset",
     ]
     assert {field.key for field in notify.fields} == {"channel", "require_armed_render"}