feat: add workflow output comparison tooling

backend/app/domains/rendering/schemas.py

@@ -188,3 +188,28 @@ class WorkflowRunOut(BaseModel):
     created_at: datetime
     node_results: list[WorkflowNodeResultOut] = []
     model_config = {"from_attributes": True}
+
+
+class WorkflowComparisonArtifactOut(BaseModel):
+    path: str | None
+    storage_key: str | None
+    exists: bool
+    file_size_bytes: int | None
+    sha256: str | None
+    mime_type: str | None
+    image_width: int | None
+    image_height: int | None
+
+
+class WorkflowRunComparisonOut(BaseModel):
+    workflow_run_id: uuid.UUID
+    workflow_def_id: uuid.UUID | None
+    order_line_id: uuid.UUID | None
+    execution_mode: str
+    status: str
+    summary: str
+    authoritative_output: WorkflowComparisonArtifactOut
+    observer_output: WorkflowComparisonArtifactOut
+    exact_match: bool | None
+    dimensions_match: bool | None
+    mean_pixel_delta: float | None