diff --git a/opensquilla-webui/src/composables/chat/useChatRouterDecisionRuntime.test.ts b/opensquilla-webui/src/composables/chat/useChatRouterDecisionRuntime.test.ts
index 3e0ca6e014..1caf043b14 100644
--- a/opensquilla-webui/src/composables/chat/useChatRouterDecisionRuntime.test.ts
+++ b/opensquilla-webui/src/composables/chat/useChatRouterDecisionRuntime.test.ts
@@ -153,6 +153,82 @@ describe('router decision identity', () => {
 })
 
 describe('appendEnsembleProgress', () => {
+  it('promotes a same-turn provisional card when its real decision arrives', () => {
+    const { runtime, messagesRef } = makeRuntime([
+      { role: 'user', text: 'q', ts: 0, turnId: 'turn-1' },
+    ])
+
+    runtime.appendEnsembleProgress({
+      event_type: 'proposer_finish',
+      turn_id: 'turn-1',
+      proposer_provider: 'openrouter',
+      proposer_model: 'qwen/qwen3.7-plus',
+    })
+    const provisional = messagesRef.value.find(message => message.role === 'router')!
+    ;(provisional as ChatMessage & { routerExecutionModel?: string }).routerExecutionModel = 'fallback-model'
+
+    runtime.queueRouterDecision({
+      turn_id: 'turn-1',
+      stream_seq: 12,
+      tier: 'c1',
+      model: 'provider/selected',
+      source: 'squilla_router',
+    })
+
+    const routers = messagesRef.value.filter(message => message.role === 'router')
+    expect(routers).toHaveLength(1)
+    expect(routers[0]).toMatchObject({
+      messageId: 'router-sess-12',
+      turnId: 'turn-1',
+      routerDecision: { model: 'provider/selected' },
+    })
+    expect(routers[0]?.ensemble?.models).toHaveLength(1)
+    expect((routers[0] as ChatMessage & { routerExecutionModel?: string }).routerExecutionModel)
+      .toBe('fallback-model')
+  })
+
+  it('does not promote a provisional card across a router control replay boundary', () => {
+    const { runtime, messagesRef } = makeRuntime([
+      { role: 'user', text: 'q', ts: 0, turnId: 'turn-1' },
+    ])
+
+    runtime.appendEnsembleProgress({
+      event_type: 'proposer_start',
+      turn_id: 'turn-1',
+      proposer_provider: 'openrouter',
+      proposer_model: 'qwen/qwen3.7-plus',
+    })
+    runtime.handleRouterControlReplay()
+    runtime.queueRouterDecision({
+      turn_id: 'turn-1',
+      stream_seq: 13,
+      tier: 'c1',
+      model: 'provider/replayed',
+      source: 'squilla_router',
+    })
+
+    expect(messagesRef.value.filter(message => message.role === 'router')).toHaveLength(2)
+  })
+
+  it('promotes a handoff card without dropping its identity', () => {
+    const { runtime, messagesRef } = makeRuntime([
+      { role: 'user', text: 'q', ts: 0, turnId: 'turn-1' },
+    ])
+
+    runtime.markEnsembleHandoff()
+    runtime.queueRouterDecision({
+      turn_id: 'turn-1',
+      stream_seq: 14,
+      tier: 'c1',
+      model: 'provider/selected',
+      source: 'squilla_router',
+    })
+
+    const routers = messagesRef.value.filter(message => message.role === 'router')
+    expect(routers).toHaveLength(1)
+    expect(routers[0]).toMatchObject({ messageId: 'router-sess-14', turnId: 'turn-1' })
+  })
+
   it('normalizes every internal candidate label to the public Proposer role', () => {
     const { runtime, messagesRef } = makeRuntime([{ role: 'user', text: 'q', ts: 0 }])
 
diff --git a/opensquilla-webui/src/composables/chat/useChatRouterDecisionRuntime.ts b/opensquilla-webui/src/composables/chat/useChatRouterDecisionRuntime.ts
index c7dd5e296c..0dfc381066 100644
--- a/opensquilla-webui/src/composables/chat/useChatRouterDecisionRuntime.ts
+++ b/opensquilla-webui/src/composables/chat/useChatRouterDecisionRuntime.ts
@@ -34,6 +34,8 @@ export function useChatRouterDecisionRuntime(options: UseChatRouterDecisionRunti
     messageId: string
   } | null>(null)
   let localRouterMessageSeq = 0
+  let routerReplayGeneration = 0
+  const provisionalRouterMessageGenerations = new Map<string, number>()
 
   // Router and ensemble events can arrive throughout a long streamed answer.
   // They should follow the live edge only while the reader has elected to stay
@@ -43,6 +45,7 @@ export function useChatRouterDecisionRuntime(options: UseChatRouterDecisionRunti
   }
 
   function handleRouterControlReplay() {
+    routerReplayGeneration += 1
     if (!options.isStreaming.value) options.startStreaming()
     pendingRouterDecision.value = null
     options.resetStreamForRouterReplay()
@@ -169,6 +172,27 @@ export function useChatRouterDecisionRuntime(options: UseChatRouterDecisionRunti
     const acceptedDecision = freezeAcceptedRoutingMode(decision, turnId)
     if (options.messages.value.some(message => message.messageId === messageId)) return
 
+    if (turnId) {
+      for (let i = options.messages.value.length - 1; i >= 0; i--) {
+        const message = options.messages.value[i]
+        const provisionalMessageId = message.messageId || ''
+        if (
+          message.role === 'router'
+          && message.provenanceKind === 'router_decision'
+          && provisionalMessageId.startsWith(`router-${options.sessionKey.value}-`)
+          && message.turnId === turnId
+          && provisionalRouterMessageGenerations.get(provisionalMessageId) === routerReplayGeneration
+        ) {
+          message.routerDecision = acceptedDecision
+          message.messageId = messageId
+          message.turnId = turnId
+          provisionalRouterMessageGenerations.delete(provisionalMessageId)
+          scrollToBottomIfFollowing()
+          return
+        }
+      }
+    }
+
     options.messages.value.push({
       role: 'router',
       text: '',
@@ -303,6 +327,7 @@ export function useChatRouterDecisionRuntime(options: UseChatRouterDecisionRunti
       ...(turnId ? { turnId } : {}),
     }
     options.messages.value.push(message)
+    provisionalRouterMessageGenerations.set(message.messageId!, routerReplayGeneration)
     return message
   }
 
@@ -343,7 +368,7 @@ export function useChatRouterDecisionRuntime(options: UseChatRouterDecisionRunti
     let target = findLiveRouterMessage(turnId)
 
     if (!target) {
-      options.messages.value.push({
+      const provisionalMessage: ChatMessage = {
         role: 'router',
         text: '',
         ts: new Date().toISOString(),
@@ -352,7 +377,9 @@ export function useChatRouterDecisionRuntime(options: UseChatRouterDecisionRunti
         messageId: `router-${options.sessionKey.value}-ensemble`,
         ensemble: emptyEnsemble(),
         ...(turnId ? { turnId } : {}),
-      })
+      }
+      options.messages.value.push(provisionalMessage)
+      provisionalRouterMessageGenerations.set(provisionalMessage.messageId!, routerReplayGeneration)
       // Re-read through the reactive array so nested mutations below trigger.
       target = options.messages.value[options.messages.value.length - 1]
     }