diff --git a/app/src/main/assets/runtime-trial-page.js b/app/src/main/assets/runtime-trial-page.js
index bfdcc8e97..f4cbe86ea 100644
--- a/app/src/main/assets/runtime-trial-page.js
+++ b/app/src/main/assets/runtime-trial-page.js
@@ -1,16 +1,25 @@
 (function(){
- var nonce='__DSHA_TRIAL_NONCE__',expectedHome=__DSHA_TRIAL_HOME__,ready=false,opened=false,message=false,sent=false,acknowledged=false,failed=false,activeSocket=null;
+ var nonce='__DSHA_TRIAL_NONCE__',expectedHome=__DSHA_TRIAL_HOME__,ready=false,opened=false,message=false,sent=false,done=false,failed=false,activeSocket=null;
+ // 诊断字段：网页到底走到哪一步（启动遮罩/boot 标记、mux socket 状态与关闭码）。
+ // 只在 4 秒后按 2 秒节流上报进度，成功与致命失败的上报路径保持不变。
+ var booting=false,socketState='none',socketCode=0,socketClean=false,started=Date.now(),lastPost=0,PROGRESS_AFTER=4000,PROGRESS_EVERY=2000;
  var Original=window.WebSocket;
  function Socket(url,protocols){var socket=protocols===undefined?new Original(url):new Original(url,protocols);try{var address=new URL(url,location.href);if(address.host===location.host&&address.pathname==='/api/remote.mux'){
-  activeSocket=socket;opened=false;message=false;
-  socket.addEventListener('open',function(){if(activeSocket===socket)opened=true});
-  socket.addEventListener('close',function(){if(activeSocket===socket){opened=false;message=false}});
-  socket.addEventListener('message',function(event){if(activeSocket!==socket)return;try{var frame=JSON.parse(event.data),value=frame.value;
-   if(frame.type==='item'&&typeof frame.streamId==='string'&&value&&value.type==='ready'&&typeof value.clientId==='string'&&value.clientId.length&&value.host&&value.host.home===expectedHome)message=true;
-  }catch(e){}});
- }}catch(e){}return socket}
+   activeSocket=socket;opened=false;message=false;socketState='connecting';socketCode=0;socketClean=false;
+   socket.addEventListener('open',function(){if(activeSocket===socket){opened=true;socketState='open'}});
+   socket.addEventListener('close',function(event){if(activeSocket!==socket)return;opened=false;message=false;socketState='closed';socketCode=event&&typeof event.code==='number'?event.code:-1;socketClean=!!(event&&event.wasClean)});
+   socket.addEventListener('error',function(){if(activeSocket===socket)socketState='error'});
+   socket.addEventListener('message',function(event){if(activeSocket!==socket)return;try{var frame=JSON.parse(event.data),value=frame.value;
+    if(frame.type==='item'&&typeof frame.streamId==='string'&&value&&value.type==='ready'&&typeof value.clientId==='string'&&value.clientId.length&&value.host&&value.host.home===expectedHome)message=true;
+   }catch(e){}});
+  }}catch(e){}return socket}
  Socket.prototype=Original.prototype;Object.setPrototypeOf(Socket,Original);window.WebSocket=Socket;
- function post(failure){if(sent||acknowledged)return;sent=true;fetch('/dsha-runtime-trial/'+nonce,{method:'POST',credentials:'same-origin',headers:{'content-type':'application/json'},body:JSON.stringify({nonce:nonce,ready:ready,transport:opened&&message,failure:failure})}).then(function(r){sent=false;if(r.ok){acknowledged=true;clearInterval(timer)}},function(){sent=false})}
- window.addEventListener('dsha-startup',function(event){try{var value=JSON.parse(event.detail);if(value.type==='ready')ready=true;if(value.type==='issue'&&value.fatal){failed=true;post(true)}}catch(e){}});
- var timer=setInterval(function(){if(failed){post(true);return}var root=document.getElementById('root'),boot=document.querySelector('[data-dsh-boot]');if(!boot&&root&&root.children.length)ready=true;if(ready&&opened&&message)post(false)},500);
+ function payload(kind){return {nonce:nonce,ready:ready,transport:opened&&message,failure:kind==='fail',kind:kind,boot:booting,socket:{state:socketState,code:socketCode,clean:socketClean}}}
+ function post(kind){if(sent||done)return;var now=Date.now();
+  if(kind==='progress'&&(now-started<PROGRESS_AFTER||now-lastPost<PROGRESS_EVERY))return;
+  lastPost=now;sent=true;
+  fetch('/dsha-runtime-trial/'+nonce,{method:'POST',credentials:'same-origin',headers:{'content-type':'application/json'},body:JSON.stringify(payload(kind))}).then(function(r){sent=false;if(r.ok&&kind!=='progress'){done=true;clearInterval(timer)}},function(){sent=false})}
+ window.addEventListener('dsha-startup',function(event){try{var value=JSON.parse(event.detail);if(value.type==='ready')ready=true;if(value.type==='issue'&&value.fatal){failed=true;post('fail')}}catch(e){}});
+ var timer=setInterval(function(){var root=document.getElementById('root'),boot=document.querySelector('[data-dsh-boot]');booting=!!boot;if(!boot&&root&&root.children.length)ready=true;
+  if(failed){post('fail');return}if(ready&&opened&&message){post('ack');return}post('progress')},500);
 })();
diff --git a/app/src/main/assets/runtime-trial-plugin.js b/app/src/main/assets/runtime-trial-plugin.js
index 45f4e62d9..55633430a 100644
--- a/app/src/main/assets/runtime-trial-plugin.js
+++ b/app/src/main/assets/runtime-trial-plugin.js
@@ -104,13 +104,30 @@ async function initialize(ctx){
  try{await writer.flush()}finally{await writer.close()}
  const reader=await ctx.sessionPersistence.open(sample.id,'read');
  try{const state=await reader.read();if(reader.header.id!==sample.id||reader.header.version!==4||state.events.length!==0)throw Error('Trial session reopen mismatch')}finally{await reader.close()}
- const hash=createHash('sha256').update(read).digest('hex');let renderer=false,failure='';
+ const hash=createHash('sha256').update(read).digest('hex');let renderer=false,failure='',pageState='';
+ // 网页侧进度上报只用于诊断：写进行输出（宿主保存在失败记录的 output 里），
+ // 不回退已经确认的 renderer，也不能把进度上报当成握手成功。
+ function reportPage(value){
+  if(!value||typeof value!=='object')return;
+  try{
+   const socket=value.socket&&typeof value.socket==='object'?value.socket:{};
+   const code=typeof socket.code==='number'&&Number.isFinite(socket.code)?Math.trunc(socket.code):-1;
+   const text=JSON.stringify({
+    kind:typeof value.kind==='string'?value.kind.slice(0,16):'',
+    ready:value.ready===true,transport:value.transport===true,failure:value.failure===true,boot:value.boot===true,
+    socket:{state:typeof socket.state==='string'?socket.state.slice(0,12):'',code:code,clean:socket.clean===true},
+   });
+   if(text===pageState)return;
+   pageState=text;
+   process.stdout.write('DSHA_TRIAL_PAGE_STATE '+text+'\n');
+  }catch{}
+ }
  const endpoint='/dsha-runtime-trial/'+nonce;
  ctx.effect(()=>ctx.webServer.register({kind:'exact',path:endpoint,handler:async(req,res)=>{
   const rejection=ctx.connection.requestRejection(req);if(rejection!==undefined){res.writeHead(rejection);res.end();return}
   if(req.method==='POST'){
    let body='';for await(const chunk of req){body+=chunk;if(body.length>4096){res.writeHead(413);res.end();return}}
-   try{const value=JSON.parse(body);if(value.nonce!==nonce)throw Error('nonce');if(value.failure)failure='TRIAL_RENDERER_FAILED';else renderer=value.ready===true&&value.transport===true;}catch{res.writeHead(400);res.end();return}
+   try{const value=JSON.parse(body);if(value.nonce!==nonce)throw Error('nonce');if(value.failure)failure='TRIAL_RENDERER_FAILED';else if(value.ready===true&&value.transport===true)renderer=true;reportPage(value)}catch{res.writeHead(400);res.end();return}
   }
   res.setHeader('content-type','application/json');res.setHeader('cache-control','no-store');res.end(JSON.stringify({nonce,pid:process.pid,port:ctx.webServer.port,dataRead:read===payload,dataWrite:true,storageReopened:true,storageFreshReopened:true,sessionReopened:true,hash,renderer,failure}));
  }}));
diff --git a/tools/test-runtime-trial.mjs b/tools/test-runtime-trial.mjs
index 28d8cde58..6857f31aa 100644
--- a/tools/test-runtime-trial.mjs
+++ b/tools/test-runtime-trial.mjs
@@ -154,12 +154,16 @@ try{
  const home='/root/.dsha-runtime-trial-'+ 'a'.repeat(32)+'/isolated-user-home';
  const readyFrame={type:'item',streamId:'test-stream',value:{type:'ready',clientId:'test-client',host:{home}}};
  const source=(await fs.readFile(path.join(repository,'app/src/main/assets/runtime-trial-page.js'),'utf8')).replace('__DSHA_TRIAL_NONCE__','a'.repeat(32)).replace('__DSHA_TRIAL_HOME__',JSON.stringify(home));
- function browser(responses){let tick,cleared=0,requests=0;const sockets=[];
+ function browser(responses){let tick,cleared=0,requests=0;const sockets=[],bodies=[];let clock=Date.now();
   function Socket(){this.events={};this.addEventListener=(name,fn)=>{this.events[name]=fn};sockets.push(this)}
-  const context={window:{WebSocket:Socket,addEventListener(){}},URL,Object,JSON,location:{href:'http://127.0.0.1:3080/',host:'127.0.0.1:3080'},
+  const context={window:{WebSocket:Socket,addEventListener(){}},URL,Object,JSON,Date:{now:()=>clock},location:{href:'http://127.0.0.1:3080/',host:'127.0.0.1:3080'},
    document:{getElementById:()=>({children:[{}]}),querySelector:()=>null},setInterval(fn){tick=fn;return 7},clearInterval(id){assert.equal(id,7);cleared++},
-   fetch:async()=>{requests++;const response=responses.shift();if(response instanceof Error)throw response;return response||{ok:true}}};
-  vm.runInNewContext(source,context);return{connect(url='ws://127.0.0.1:3080/api/remote.mux',frame=readyFrame){new context.window.WebSocket(url);const socket=sockets.at(-1);socket.events.open?.();socket.events.message?.({data:JSON.stringify(frame)});},async tick(){tick();await new Promise(resolve=>setImmediate(resolve));},get requests(){return requests},get cleared(){return cleared}};
+   fetch:async(url,init)=>{requests++;bodies.push(JSON.parse(init.body));const response=responses.shift();if(response instanceof Error)throw response;return response||{ok:true}}};
+  vm.runInNewContext(source,context);
+  return{connect(url='ws://127.0.0.1:3080/api/remote.mux',frame=readyFrame){new context.window.WebSocket(url);const socket=sockets.at(-1);socket.events.open?.();socket.events.message?.({data:JSON.stringify(frame)});return socket},
+   openOnly(url='ws://127.0.0.1:3080/api/remote.mux'){new context.window.WebSocket(url);const socket=sockets.at(-1);socket.events.open?.();return socket},
+   async tick(){tick();await new Promise(resolve=>setImmediate(resolve))},advance(ms){clock+=ms},
+   get requests(){return requests},get cleared(){return cleared},get bodies(){return bodies}};
  }
  for(const response of [{ok:false},new Error('synthetic_network_failure')])await test('synthetic_renderer_retry_'+(response instanceof Error?'network':'http'),async()=>{
   const page=browser([response,{ok:true}]);page.connect();await page.tick();assert.equal(page.requests,1);assert.equal(page.cleared,0);
@@ -168,6 +172,25 @@ try{
  await test('synthetic_foreign_socket_cannot_acknowledge_trial',async()=>{const page=browser([]);page.connect('ws://127.0.0.1:9999/socket');await page.tick();assert.equal(page.requests,0);assert.equal(page.cleared,0);});
  await test('synthetic_error_or_unrelated_frame_is_not_a_backend_handshake',async()=>{for(const frame of [{type:'error',streamId:'bad',error:{}},{type:'item',streamId:'another',value:{message:'not ready'}}]){const page=browser([]);page.connect(undefined,frame);await page.tick();assert.equal(page.requests,0)}});
  await test('synthetic_wrong_trial_home_cannot_acknowledge',async()=>{const page=browser([]);page.connect(undefined,{...readyFrame,value:{...readyFrame.value,host:{home:'/other-generation'}}});await page.tick();assert.equal(page.requests,0)});
+ // 未完成握手时只上报诊断进度，且不能清掉重试定时器或冒充成功。
+ await test('synthetic_progress_report_exposes_page_state',async()=>{
+  const page=browser([]);page.openOnly();await page.tick();assert.equal(page.requests,0);
+  page.advance(4500);await page.tick();assert.equal(page.requests,1);
+  const body=page.bodies[0];assert.equal(body.kind,'progress');assert.equal(body.ready,true);assert.equal(body.transport,false);
+  assert.equal(body.failure,false);assert.equal(body.boot,false);assert.equal(body.socket.state,'open');assert.equal(body.socket.code,0);
+  assert.equal(page.cleared,0);
+ });
+ await test('synthetic_socket_close_code_is_reported',async()=>{
+  const page=browser([]);const socket=page.openOnly();socket.events.close?.({code:1006,wasClean:false});
+  page.advance(4500);await page.tick();assert.equal(page.requests,1);
+  const body=page.bodies[0];assert.equal(body.transport,false);assert.equal(body.socket.state,'closed');
+  assert.equal(body.socket.code,1006);assert.equal(body.socket.clean,false);
+ });
+ await test('synthetic_progress_report_is_throttled',async()=>{
+  const page=browser([]);page.openOnly();page.advance(4500);await page.tick();assert.equal(page.requests,1);
+  page.advance(600);await page.tick();assert.equal(page.requests,1);
+  page.advance(2500);await page.tick();assert.equal(page.requests,2);
+ });
 }catch{process.exitCode=1;}
 finally{
  const report={version:1,platform:process.platform,node:process.version,fixture:'synthetic, private temporary directory',androidRendererVerified:false,results};