diff --git a/backend/tests/domains/test_workflow_executor.py b/backend/tests/domains/test_workflow_executor.py
new file mode 100644
index 0000000..e405191
--- /dev/null
+++ b/backend/tests/domains/test_workflow_executor.py
@@ -0,0 +1,130 @@
+from __future__ import annotations
+
+from types import SimpleNamespace
+
+from app.core.process_steps import StepName
+from app.domains.rendering.workflow_executor import _topological_sort, dispatch_workflow
+from app.domains.rendering.workflow_schema import WorkflowConfig
+
+
+def test_topological_sort_supports_full_phase_3_bridge_sequence():
+    config = WorkflowConfig.model_validate(
+        {
+            "version": 1,
+            "nodes": [
+                {"id": "setup", "step": StepName.ORDER_LINE_SETUP.value, "params": {}},
+                {"id": "template", "step": StepName.RESOLVE_TEMPLATE.value, "params": {}},
+                {"id": "materials", "step": StepName.MATERIAL_MAP_RESOLVE.value, "params": {}},
+                {"id": "autofill", "step": StepName.AUTO_POPULATE_MATERIALS.value, "params": {}},
+                {"id": "bbox", "step": StepName.GLB_BBOX.value, "params": {}},
+                {"id": "render", "step": StepName.BLENDER_STILL.value, "params": {}},
+                {"id": "save", "step": StepName.OUTPUT_SAVE.value, "params": {}},
+                {"id": "notify", "step": StepName.NOTIFY.value, "params": {}},
+            ],
+            "edges": [
+                {"from": "setup", "to": "template"},
+                {"from": "template", "to": "materials"},
+                {"from": "materials", "to": "autofill"},
+                {"from": "autofill", "to": "bbox"},
+                {"from": "bbox", "to": "render"},
+                {"from": "render", "to": "save"},
+                {"from": "save", "to": "notify"},
+            ],
+        }
+    )
+
+    ordered_nodes = _topological_sort(config)
+
+    assert [node.id for node in ordered_nodes] == [
+        "setup",
+        "template",
+        "materials",
+        "autofill",
+        "bbox",
+        "render",
+        "save",
+        "notify",
+    ]
+
+
+def test_dispatch_workflow_skips_bridge_nodes_and_dispatches_mapped_render_tasks(monkeypatch):
+    calls: list[tuple[str, list[str], dict]] = []
+
+    def _fake_send_task(task_name: str, args: list[str], kwargs: dict):
+        calls.append((task_name, args, kwargs))
+        return SimpleNamespace(id=f"task-{len(calls)}")
+
+    monkeypatch.setattr("app.tasks.celery_app.celery_app.send_task", _fake_send_task)
+
+    task_ids = dispatch_workflow(
+        {
+            "version": 1,
+            "nodes": [
+                {"id": "setup", "step": StepName.ORDER_LINE_SETUP.value, "params": {}},
+                {"id": "template", "step": StepName.RESOLVE_TEMPLATE.value, "params": {}},
+                {"id": "render", "step": StepName.BLENDER_STILL.value, "params": {"samples": 128}},
+                {"id": "save", "step": StepName.OUTPUT_SAVE.value, "params": {}},
+                {"id": "notify", "step": StepName.NOTIFY.value, "params": {}},
+            ],
+            "edges": [
+                {"from": "setup", "to": "template"},
+                {"from": "template", "to": "render"},
+                {"from": "render", "to": "save"},
+                {"from": "save", "to": "notify"},
+            ],
+        },
+        context_id="line-123",
+    )
+
+    assert task_ids == ["task-1"]
+    assert calls == [
+        (
+            "app.domains.rendering.tasks.render_order_line_still_task",
+            ["line-123"],
+            {"samples": 128},
+        )
+    ]
+
+
+def test_dispatch_workflow_preserves_mapped_task_order_around_phase_3_bridge_nodes(monkeypatch):
+    calls: list[tuple[str, list[str], dict]] = []
+
+    def _fake_send_task(task_name: str, args: list[str], kwargs: dict):
+        calls.append((task_name, args, kwargs))
+        return SimpleNamespace(id=f"task-{len(calls)}")
+
+    monkeypatch.setattr("app.tasks.celery_app.celery_app.send_task", _fake_send_task)
+
+    task_ids = dispatch_workflow(
+        {
+            "version": 1,
+            "nodes": [
+                {"id": "setup", "step": StepName.ORDER_LINE_SETUP.value, "params": {}},
+                {"id": "render", "step": StepName.BLENDER_STILL.value, "params": {"width": 1024}},
+                {"id": "save", "step": StepName.OUTPUT_SAVE.value, "params": {}},
+                {"id": "export", "step": StepName.EXPORT_BLEND.value, "params": {"include_textures": True}},
+                {"id": "notify", "step": StepName.NOTIFY.value, "params": {}},
+            ],
+            "edges": [
+                {"from": "setup", "to": "render"},
+                {"from": "render", "to": "save"},
+                {"from": "save", "to": "export"},
+                {"from": "export", "to": "notify"},
+            ],
+        },
+        context_id="line-456",
+    )
+
+    assert task_ids == ["task-1", "task-2"]
+    assert calls == [
+        (
+            "app.domains.rendering.tasks.render_order_line_still_task",
+            ["line-456"],
+            {"width": 1024},
+        ),
+        (
+            "app.domains.rendering.tasks.export_blend_for_order_line_task",
+            ["line-456"],
+            {"include_textures": True},
+        ),
+    ]
diff --git a/docs/workflows/WORKFLOW_DELIVERY_CHECKLIST.md b/docs/workflows/WORKFLOW_DELIVERY_CHECKLIST.md
index aec0697..06ae9a4 100644
--- a/docs/workflows/WORKFLOW_DELIVERY_CHECKLIST.md
+++ b/docs/workflows/WORKFLOW_DELIVERY_CHECKLIST.md
@@ -19,10 +19,10 @@
 
 ### Phase 3
 
-- [ ] Missing legacy steps extracted into reusable executors
-- [ ] Extracted node behavior matches legacy services
-- [ ] Node-level tests cover success and failure paths
-- Progress: `order_line_setup`, `resolve_template`, `material_map_resolve`, `auto_populate_materials`, `glb_bbox`, `output_save`, and `notify` are extracted and covered by targeted backend tests; remaining parity nodes are still open.
+- [x] Missing legacy steps extracted into reusable executors
+- [x] Extracted node behavior matches legacy services
+- [x] Node-level tests cover success and failure paths
+- Progress: Phase 3 parity nodes are extracted, covered by targeted runtime tests, and exercised through the workflow executor with legacy-safe bridge dispatch.
 
 ### Phase 4
 
diff --git a/docs/workflows/WORKFLOW_IMPLEMENTATION_BACKLOG.md b/docs/workflows/WORKFLOW_IMPLEMENTATION_BACKLOG.md
index 5b3d014..86692ab 100644
--- a/docs/workflows/WORKFLOW_IMPLEMENTATION_BACKLOG.md
+++ b/docs/workflows/WORKFLOW_IMPLEMENTATION_BACKLOG.md
@@ -58,7 +58,7 @@
 - `E3-T6` Extract `glb_bbox`. `completed`
 - `E3-T7` Extract `output_save`. `completed`
 - `E3-T8` Extract `notify`. `completed`
-- `E3-T9` Add executor tests for all extracted nodes.
+- `E3-T9` Add executor tests for all extracted nodes. `completed`
 
 ### Legacy Sources
 
diff --git a/docs/workflows/WORKFLOW_MIGRATION_PLAN.md b/docs/workflows/WORKFLOW_MIGRATION_PLAN.md
index 90c2202..0a30609 100644
--- a/docs/workflows/WORKFLOW_MIGRATION_PLAN.md
+++ b/docs/workflows/WORKFLOW_MIGRATION_PLAN.md
@@ -8,7 +8,7 @@ Bring `/workflows` to full production parity with the existing legacy render pip
 
 - Phase 1 completed on canonical config storage, preset migration, and legacy-safe runtime extraction.
 - Phase 2 completed on backend node registry, node definitions API, and schema-driven editor palette/settings.
-- Phase 3 in progress: `order_line_setup`, `resolve_template`, `material_map_resolve`, `auto_populate_materials`, `glb_bbox`, `output_save`, and `notify` are extracted behind the legacy task boundary and validated with targeted backend tests.
+- Phase 3 completed: `order_line_setup`, `resolve_template`, `material_map_resolve`, `auto_populate_materials`, `glb_bbox`, `output_save`, and `notify` are extracted behind the legacy task boundary, validated with targeted backend tests, and covered by workflow executor dispatch tests.
 
 ## Non-Negotiables