fix(consult): 窗口溢出重试保留预跑证据包，回填修复版本 SHA

frontend/src/app/api/consult/route.ts

@@ -895,6 +895,7 @@ export async function POST(request: Request) {
       ];
     };
     let baseMessages = consultationBaseMessages(false);
+    let windowPacketMessage: string | null = null;
     const agentAbortSignal = AbortSignal.timeout(AGENT_TIMEOUT_MS);
     const streamOptions = {
       runId: requestId,
@@ -930,6 +931,9 @@ export async function POST(request: Request) {
         // clients cannot parse rectification `attempt.reset`, so the retry stays
         // server-side and never opens a second user-visible wait.
         baseMessages = consultationBaseMessages(true);
+        if (windowPacketMessage) {
+          baseMessages = [...baseMessages, { role: "user" as const, content: windowPacketMessage }];
+        }
         const overflow = await agent.stream(baseMessages, options);
         usages.push(overflow.totalUsage);
         return overflow;
@@ -1111,9 +1115,10 @@ export async function POST(request: Request) {
                 },
               },
             });
+            windowPacketMessage = windowPrecomputedPacketMessage(packet);
             baseMessages = [
               ...baseMessages,
-              { role: "user" as const, content: windowPrecomputedPacketMessage(packet) },
+              { role: "user" as const, content: windowPacketMessage },
             ];
           } catch {
             // Leave the contract red; the model may still call the tool.

frontend/tests/consultation-workflow-contract.test.ts

@@ -368,6 +368,9 @@ test("window calculation is precomputed on the agent context cache (BUG-957)", (
   assert.match(windowBranch, /precomputeWindowConsultation/);
   assert.match(windowBranch, /warmup:/);
   assert.match(windowBranch, /windowPrecomputedPacketMessage/);
+  assert.match(route, /let windowPacketMessage: string \| null = null/);
+  assert.match(route, /if \(windowPacketMessage\) \{/);
+  assert.match(route, /content: windowPacketMessage/);
   assert.doesNotMatch(windowBranch, /toolChoice:\s*"required"/);
   assert.doesNotMatch(natalBranch, /precomputeWindowConsultation/);
   assert.doesNotMatch(natalBranch, /warmup:/);