refactor: remove legacy assistant compatibility

frontend/src/components/workflow/ConditionEdge.tsx

@@ -1,7 +1,7 @@
 "use client";
 
 /**
- * Workflow v3 edge: LLM judgement, variable expression, or deterministic default.
+ * Workflow v4 edge: LLM judgement, variable expression, or deterministic default.
  */
 
 import {

frontend/src/components/workflow/GenericNode.tsx

@@ -18,7 +18,6 @@ import {
 } from "./context";
 import {
   accentVar,
-  messageCompletionPolicy,
   type WorkflowNodeData,
 } from "./specs";
 
@@ -31,7 +30,7 @@ export function GenericNode({ id, type, data, selected }: NodeProps) {
   if (!spec) return null;
 
   const nodeData = data as WorkflowNodeData;
-  const messagePolicy = messageCompletionPolicy(nodeData);
+  const messagePolicy = nodeData.completionPolicy ?? "playback";
   const Icon = spec.icon;
   const preview = (
     nodeData.prompt ||

frontend/src/components/workflow/panels/ActionNodePanel.tsx

@@ -6,10 +6,7 @@ import { SectionCard } from "@/components/editor/section-card";
 import { ToolBindingEditor } from "@/components/tools/tool-binding-editor";
 
 import { NodeSelect } from "./controls";
-import {
-  actionUserInputPolicy,
-  type WorkflowNodeData,
-} from "../specs";
+import { type WorkflowNodeData } from "../specs";
 import type { ModelOption } from "../types";
 import type { DynamicVariableDefinition } from "@/lib/api";
 
@@ -28,7 +25,7 @@ export function ActionNodePanel({
   dynamicVariableDefinitions,
   runtimeMode,
 }: ActionNodePanelProps) {
-  const userInputPolicy = actionUserInputPolicy(draft);
+  const userInputPolicy = draft.userInputPolicy ?? "queue";
 
   return (
     <SectionCard

frontend/src/components/workflow/panels/GlobalSettingsPanel.tsx

@@ -87,7 +87,7 @@ export function GlobalSettingsPanel({
                 ? [{ value: "edge_tool", label: "边工具（Realtime 必需）" }]
                 : [
                     { value: "edge_tool", label: "边工具（低延迟）" },
-                    { value: "llm_router", label: "独立 LLM Router（兼容）" },
+                    { value: "llm_router", label: "独立 LLM Router" },
                   ]
             }
             onChange={(llmRoutingMode) =>

frontend/src/components/workflow/panels/MessageNodePanel.tsx

@@ -14,7 +14,6 @@ import {
 import { Textarea } from "@/components/ui/textarea";
 
 import {
-  messageCompletionPolicy,
   type MessageCompletionPolicy,
   type WorkflowNodeData,
 } from "../specs";
@@ -51,17 +50,13 @@ export function MessageNodePanel({
   set: (key: string, value: unknown) => void;
   setPatch: (patch: Partial<WorkflowNodeData>) => void;
 }) {
-  const completionPolicy = messageCompletionPolicy(draft);
+  const completionPolicy = draft.completionPolicy ?? "playback";
   const completionDescription = COMPLETION_OPTIONS.find(
     (option) => option.value === completionPolicy,
   )?.description;
 
   const selectCompletionPolicy = (value: MessageCompletionPolicy) => {
-    setPatch({
-      completionPolicy: value,
-      requireConfirmation: undefined,
-      showMessage: undefined,
-    });
+    setPatch({ completionPolicy: value });
   };
 
   return (

frontend/src/components/workflow/specs.ts

@@ -1,4 +1,4 @@
-/** Workflow v3 public graph types and defaults. */
+/** Current Workflow graph types and defaults. */
 
 import * as LucideIcons from "lucide-react";
 import { Circle, type LucideIcon } from "lucide-react";
@@ -68,13 +68,9 @@ export type WorkflowNodeData = {
   updates?: StateUpdateRule[];
   userInputPolicy?: ActionUserInputPolicy;
   speech?: string;
-  /** Legacy field read only while an older graph is open in the editor. */
-  showMessage?: boolean;
   title?: string;
   confirmLabel?: string;
   completionPolicy?: MessageCompletionPolicy;
-  /** Legacy field read only while an older graph is open in the editor. */
-  requireConfirmation?: boolean;
   targetType?: "ai" | "human" | "queue" | "phone";
   target?: string;
   message?: string;
@@ -82,27 +78,6 @@ export type WorkflowNodeData = {
   [key: string]: unknown;
 };
 
-/** Infer the new Message policy for graphs saved before it was explicit. */
-export function messageCompletionPolicy(
-  data: WorkflowNodeData,
-): MessageCompletionPolicy {
-  if (
-    data.completionPolicy === "interruptible" ||
-    data.completionPolicy === "playback" ||
-    data.completionPolicy === "confirmation"
-  ) {
-    return data.completionPolicy;
-  }
-  return data.requireConfirmation === true ? "confirmation" : "playback";
-}
-
-/** Older Action nodes allowed input to continue, which matches queue. */
-export function actionUserInputPolicy(
-  data: WorkflowNodeData,
-): ActionUserInputPolicy {
-  return data.userInputPolicy === "block" ? "block" : "queue";
-}
-
 export type ExpressionRule = {
   variable: string;
   operator: ExpressionOperator;