feat(v3): T26 两级智能体（大模型规划/审查 + 本地小模型执行，D7）

- run_dual 编排：规划者两阶段 JSON（plan/review，失败回喂重试一次再降级），
  redo 时裁决意见回喂执行者，交接上限 agent.max_handoffs（默认 2）
- 交接文档 agent_runs/{id}/handoff.json（智能体版交流文本：instructions/acceptance/exchanges）
- /agent 新增 executor_pool_id；规划者==执行者条目拒绝；整体 token_cap 覆盖两级调用
- ToolLoop 增 emit_final 开关（内层循环不发终态，防前端 SSE 提前收口）
- 前端：执行者选择器 + phase/message 事件渲染（阶段徽标 + 双色消息卡）
- 测试 +3（done/redo/执行者故障），全量 277 passed
- fix(tests): test_config_get_put_reset 增加设置备份/恢复隔离，防止清掉用户真实配置

webapp/src/api/index.ts

@@ -311,7 +311,7 @@ export async function listPoolModels(id: string) {
 // ── 智能体（工具调用） ───────────────────────────────────────────────────────
 
 export interface AgentEvent {
-  type: 'round' | 'tool_call' | 'tool_result' | 'usage' | 'final'
+  type: 'round' | 'tool_call' | 'tool_result' | 'usage' | 'final' | 'phase' | 'message'
   ts?: number
   round?: number
   name?: string
@@ -322,6 +322,12 @@ export interface AgentEvent {
   completion_tokens?: number
   reason?: string
   error?: string
+  // 两级模式（D7）
+  phase?: 'plan' | 'execute' | 'review'
+  handoff?: number
+  model?: string
+  role?: 'planner' | 'executor'
+  content?: string
 }
 
 export interface AgentStatus {
@@ -337,12 +343,21 @@ export interface AgentStatus {
   started_at?: number
   finished_at?: number
   workspace?: string
+  executor_model?: string
+  mode?: 'single' | 'dual'
 }
 
-/** POST /agent：提交智能体任务（workspace 可选：选中工作目录） */
-export async function startAgent(task: string, poolId?: string, workspace?: string) {
-  const { data } = await http.post<{ request_id: string; status: string; model: string; workspace?: string }>(
-    '/agent', { task, pool_id: poolId || undefined, workspace: workspace || undefined })
+/** POST /agent：提交智能体任务（executorPoolId 可选：两级模式的执行者/本地小模型） */
+export async function startAgent(task: string, poolId?: string, workspace?: string, executorPoolId?: string) {
+  const { data } = await http.post<{
+    request_id: string; status: string; model: string
+    workspace?: string; mode?: 'single' | 'dual'; executor_model?: string
+  }>('/agent', {
+    task,
+    pool_id: poolId || undefined,
+    workspace: workspace || undefined,
+    executor_pool_id: executorPoolId || undefined,
+  })
   return data
 }
 

webapp/src/views/AgentView.vue

@@ -49,6 +49,13 @@
           <option value="">默认模型（模型池 Agent 角色 / Architect 设置）</option>
           <option v-for="e in agentModels" :key="e.id" :value="e.id">{{ e.name }}（{{ e.model }}）</option>
         </select>
+        <select v-model="selectedExecutorId" class="model-select executor-select"
+          title="两级模式：大模型拆解/审查，本地小模型执行工具轮">
+          <option value="">单模型模式（规划者全程包办）</option>
+          <option v-for="e in executorCandidates" :key="e.id" :value="e.id">
+            🔧 执行者：{{ e.name }}（{{ e.model }}）
+          </option>
+        </select>
       </div>
       <div class="task-bar">
         <textarea v-model="task" class="task-input" rows="3"
@@ -66,6 +73,17 @@
         <template v-for="(ev, i) in events" :key="i">
           <div v-if="ev.type === 'round'" class="ev-round">— 第 {{ ev.round }} 轮 —</div>
 
+          <div v-else-if="ev.type === 'phase'" class="ev-phase" :class="'ph-' + ev.phase">
+            {{ phaseLabel(ev) }}
+          </div>
+
+          <div v-else-if="ev.type === 'message'" class="ev-msg">
+            <div class="ev-title">
+              {{ ev.role === 'planner' ? '🧠 规划者' : '🔧 执行者' }}{{ ev.handoff ? `（第 ${ev.handoff} 轮交接）` : '' }}
+            </div>
+            <pre class="ev-msgbody" :class="ev.role === 'planner' ? 'msg-planner' : 'msg-executor'">{{ ev.content }}</pre>
+          </div>
+
           <div v-else-if="ev.type === 'tool_call' && ev.name === 'edit_file'" class="ev-card">
             <div class="ev-title">✏️ 精确编辑 <b>{{ (ev.arguments as any)?.path }}</b></div>
             <pre class="diff-old">- {{ (ev.arguments as any)?.old_string }}</pre>
@@ -171,6 +189,9 @@ const manualPath = ref('')
 const createIfMissing = ref(false)
 const allowShell = ref(false)
 
+// 两级模式
+const selectedExecutorId = ref('')
+
 const wsFiles = ref<{ name: string; type: string; size?: number }[]>([])
 const loadingWs = ref(false)
 const filePreview = ref<{ path: string; content: string; truncated: boolean } | null>(null)
@@ -180,6 +201,18 @@ let _watch: ReturnType<typeof watchAgent> | null = null
 
 const agentModels = computed(() => poolEntries.value.filter(e => e.enabled))
 
+const executorCandidates = computed(() =>
+  poolEntries.value
+    .filter(e => e.enabled && e.backend !== 'mock')
+    .sort((a, b) => (a.backend === 'llama_server' ? -1 : 0) - (b.backend === 'llama_server' ? -1 : 0)))
+
+function phaseLabel(ev: AgentEvent) {
+  const m = ev.model ? ` · ${ev.model}` : ''
+  if (ev.phase === 'plan') return `🧠 规划者 · 拆解任务${m}`
+  if (ev.phase === 'execute') return `🔧 执行者 · 工具执行（第 ${ev.handoff} 轮交接）${m}`
+  return `🔍 规划者 · 审查裁决${m}`
+}
+
 const finalResponse = computed(() => ((statusInfo.value as any)?.response || ''))
 
 const statusLine = computed(() => {
@@ -281,7 +314,8 @@ async function run() {
   events.value = []
   statusInfo.value = null
   try {
-    const init = await startAgent(task.value.trim(), selectedPoolId.value, selectedRoot.value)
+    const init = await startAgent(task.value.trim(), selectedPoolId.value, selectedRoot.value,
+                                  selectedExecutorId.value)
     if (init.workspace) selectedRoot.value = init.workspace
     _watch = watchAgent(init.request_id)
     _watch.subscribe({
@@ -481,6 +515,37 @@ onMounted(async () => {
   font-size: 12px;
   margin: 10px 0;
 }
+.ev-phase {
+  text-align: center;
+  font-size: 12px;
+  font-weight: 600;
+  border-radius: 12px;
+  padding: 4px 14px;
+  margin: 12px auto 8px;
+  width: fit-content;
+  max-width: 90%;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+.ph-plan { color: #1e40af; background: #dbeafe; }
+.ph-execute { color: #166534; background: #dcfce7; }
+.ph-review { color: #7c2d12; background: #ffedd5; }
+.ev-msg { margin-bottom: 8px; }
+.ev-msgbody {
+  margin: 4px 0 0;
+  padding: 8px 12px;
+  border-radius: 8px;
+  font-size: 13px;
+  font-family: inherit;
+  white-space: pre-wrap;
+  word-break: break-word;
+  max-height: 260px;
+  overflow-y: auto;
+}
+.msg-planner { background: #eff6ff; color: #1e3a8a; border: 1px solid #bfdbfe; }
+.msg-executor { background: #f0fdf4; color: #14532d; border: 1px solid #bbf7d0; }
+.executor-select { flex: 1; max-width: 340px; }
 .ev-card {
   border: 1px solid #e5e7eb;
   border-radius: 8px;