diff --git a/perf/lazy.mjs b/perf/lazy.mjs
index b1afee7..4d42e3f 100644
--- a/perf/lazy.mjs
+++ b/perf/lazy.mjs
@@ -108,8 +108,12 @@ async function run(name){
   await page.evaluate(async()=>{const r=await navigator.serviceWorker.getRegistration();r.waiting.postMessage({type:'SKIP_WAITING'});});
   await wait(page,async tag=>{const c=await caches.open('ytplayer-assets');return(await(await c.match('/__ytp_asset_state')).json()).current.buildTag===tag;},target.buildTag);
   await page.reload();await page.waitForSelector('#carModeBtn');assert.equal(await page.evaluate(()=>Lazy.manifest.buildTag),target.buildTag);
-  // No warm: the new page gets a same-contract N-1 file immediately from disk.
+  // Completion now runs even with Save-Data. Evict a real completed entry to
+  // exercise the same-contract N-1 fallback, rather than suppressing the job.
+  await wait(page,async()=>{const r=await navigator.serviceWorker.getRegistration();return (await SwUpdate.askCacheStatus(r.active))?.offlineReady;});
+  disconnected=true;await proxy.setOffline(true);await stop();
   const cacheKey='/video-edit.js?v='+target.files['/video-edit.js'].h;
+  await page.evaluate(async key=>{localStorage.setItem('perf-offline','1');await(await caches.open('ytplayer-assets')).delete(key);},cacheKey);
   assert.equal(await page.evaluate(async key=>!!await(await caches.open('ytplayer-assets')).match(key),cacheKey),false);
   const stale=await page.evaluate(async key=>{const r=await fetch(key);return {h:r.headers.get('X-Asset-Hash'),body:await r.text()};},cacheKey);
   assert.equal(stale.h,previous.files['/video-edit.js'].h);assert.ok(!stale.body.includes('// phase3 new file'));
@@ -121,6 +125,7 @@ async function run(name){
   assert.ok(oldRequests.some(u=>u.includes('/car-mode.js?v='+previous.files['/car-mode.js'].h)));
   await old.evaluate(()=>Lazy.load('feature:setlist-import'));assert.equal(await old.evaluate(()=>window.SetlistImport===window.__pinned),true);
   // Warm new files explicitly; compatible, unexecuted old-page group selects new cached URL.
+  await start();disconnected=false;await proxy.setOffline(false);await page.evaluate(()=>localStorage.removeItem('perf-offline'));
   await page.evaluate(async()=>{const r=await navigator.serviceWorker.getRegistration();r.active.postMessage({type:'WARM_ASSETS',saveData:false});});
   await wait(page,async key=>!!await(await caches.open('ytplayer-assets')).match(key),cacheKey);
   await old.evaluate(()=>Lazy.load('feature:video-edit'));assert.ok(oldRequests.some(u=>u.includes(cacheKey)));
@@ -130,6 +135,6 @@ async function run(name){
   if(offlineTransportErrors.length)assert.ok(failedRequests.some(url=>/\/api\/(?:recommendations|version)/.test(url))); 
   results.push({browser:name,sourceBuildTag:previous.buildTag,classicSharedDefaults:true,cssOrderPreserved:true,settingsSearch:true,carControls:4,offlineFeature:true,firstUseNetwork:0,layoutsOffline:['glass-stage','bento-hub','f7-swipe','classic'],pinned:true,compatibleUnexecutedNewURL:true,incompatibleN1ReloadRequired:true,stagedN1:true,playbackGuard:true,prePaintLayout:true,offlineSettingsPanels:true,scriptErrors:[],offlineTransportErrors});
   console.log(name,'PASS');
- } finally {await browser?.close();await proxy?.close();await stop();}
+ } catch(error){console.error(name,error.stack);throw error;} finally {await browser?.close();proxy?.server.closeAllConnections();await proxy?.close();await stop();}
 }
 try{for(const name of requested==='all'?['chromium','webkit']:[requested])await run(name);writeFileSync(args.includes('--out')?resolve(args[args.indexOf('--out')+1]):join(repo,'perf/results/phase3-lazy-2026-10-08.json'),JSON.stringify({results},null,2)+'\n');}finally{rmSync(scratch,{recursive:true,force:true});}
diff --git a/perf/migration.mjs b/perf/migration.mjs
index dbe97d7..06d4942 100644
--- a/perf/migration.mjs
+++ b/perf/migration.mjs
@@ -102,7 +102,9 @@ async function run(name) {
     await page.waitForFunction(() => !!navigator.serviceWorker.controller, { timeout: 90000 });
     assert.equal(await page.locator('meta[name="ytp-build"]').getAttribute('content'), oldTag);
     assert.equal(banners, 0, 'no first-install banner');
+    console.log(name,'old shell installed');
     await stop(); unlinkSync(join(cwd, 'public')); await start(false);
+    console.log(name,'new server started');
     const backend = `http://127.0.0.1:${port}`;
     const manifest = await (await fetch(`${backend}/api/manifest`)).json();
     assert.notEqual(manifest.buildTag, oldTag);
@@ -119,10 +121,12 @@ async function run(name) {
     proxy.resetStats(); proxy.startTracking();
     const started = Date.now();
     // Use the old application's public functions; no simulated update helper.
+    console.log(name,'requesting old-client update');
     await page.evaluate(async () => {
       await checkBuildTag();
       await (await navigator.serviceWorker.getRegistration()).update();
     });
+    console.log(name,'old-client update check returned');
     await waitAsync(page,async () => !!(await navigator.serviceWorker.getRegistration())?.waiting);
     await page.waitForFunction(() => /Update available/.test(document.querySelector('#modalTitle')?.textContent || '') && !document.querySelector('#modal').classList.contains('hidden'));
     assert.equal(banners, 1, 'exactly one offer before refresh');
@@ -137,17 +141,24 @@ async function run(name) {
       return !reg.installing && reg.waiting?.state==='installed' &&
         !!await cache.match('/__ytp_candidate/'+tag);
     }, manifest.buildTag);
+    console.log(name,'candidate installed');
     const status = await page.evaluate(async()=>SwUpdate.askCacheStatus((await navigator.serviceWorker.getRegistration()).waiting,{timeoutMs:4000}));
     assert.equal(status?.ready,true,'new worker confirms persistent cache to old helper');
     assert.equal(status.version,manifest.buildTag,'status belongs to the target build');
+    console.log(name,'ready status received');
     const oldTab = await context.newPage();
     await oldTab.goto(origin,{waitUntil:'load'});
     assert.equal(await oldTab.locator('meta[name="ytp-build"]').getAttribute('content'),oldTag);
     const oldBytes = await oldTab.evaluate(async()=>await (await fetch('/app.js')).text());
-    await page.locator('#modal').getByRole('button', { name: 'Refresh UI', exact: true }).click();
+    console.log(name,'clicking legacy refresh');
+    await page.locator('#modal').getByRole('button', { name: 'Refresh UI', exact: true }).click({noWaitAfter:true,timeout:15000});
+    console.log(name,'legacy refresh clicked');
     await page.waitForFunction(tag => document.querySelector('meta[name="ytp-build"]')?.content === tag && typeof checkBuildTag === 'function', manifest.buildTag, { timeout: 90000 });
+    console.log(name,'new page loaded');
     await page.waitForFunction(() => !sessionStorage.getItem('ytpUpdateAttempt'));
+    console.log(name,'update outcome cleared');
     await page.evaluate(async () => { await checkBuildTag(); await checkBuildTag(); await checkBuildTag(); });
+    console.log(name,'banner rechecks complete');
     await sleep(2000);
     assert.equal(navigations - before, 1, 'one reload, no update loop');
     assert.equal(banners, 1, 'no banner after applying the current build');
@@ -225,7 +236,7 @@ async function run(name) {
     const result = { browser: name, oldTag, newTag: manifest.buildTag, banners, updateReloads: 1, cachedFiles: cacheResult.count, durationMs, wireBytes: stats.totalWireBytes, offline: true, legacyURLs: 21, profile, userInitiatedOnly: true, playbackGuard: true, evictionRepair: true, incrementalRefresh: true, offlineTransportErrors: errors.length };
     console.log(JSON.stringify(result));
     return result;
-  } finally {
+  } catch(error) { console.error(name,error.stack); throw error; } finally {
     await browser?.close();
     if (proxy) { proxy.server.closeAllConnections(); await proxy.close(); }
     await stop();
diff --git a/perf/offline-complete.mjs b/perf/offline-complete.mjs
index 5dbfe05..cd0e86e 100644
--- a/perf/offline-complete.mjs
+++ b/perf/offline-complete.mjs
@@ -21,16 +21,18 @@ async function run(engine){
  const result={engine,legacy,failures:[],events:[],layouts:[],conditions:[]};results.push(result);
  try{
   if(!await poll(async()=>{try{return(await fetch(origin+'/api/version')).ok;}catch{return false;}}))throw Error(log);
-  proxy=createThrottleProxy({targetPort:port,profile:'unthrottled'});origin='http://127.0.0.1:'+await proxy.listen();
+  proxy=createThrottleProxy({targetPort:port,profile:'unthrottled'});proxy.startTracking();origin='http://127.0.0.1:'+await proxy.listen();
   const manifest=await(await fetch(origin+'/api/manifest')).json();result.build=manifest.buildTag;
-  const type={chromium,webkit}[engine];context=await type.launchPersistentContext(join(cwd,'profile'),{headless:true});browser=context.browser();
+  const type={chromium,webkit}[engine];
+  const openContext=async()=>{if(engine==='webkit'){browser ||= await type.launch();return browser.newContext();}return type.launchPersistentContext(join(cwd,'profile'),{headless:true});};
+  context=await openContext();
   const configure=async()=>{await context.route('**/*',r=>r.continue());return context.addInitScript(()=>{Object.defineProperty(navigator,'onLine',{configurable:true,get:()=>localStorage.getItem('perf-offline')!=='1'});Object.defineProperty(navigator,'connection',{configurable:true,value:{get saveData(){return localStorage.getItem('perf-save-data')==='1';}}});});};
   await configure();if(args.includes('--save-data'))await context.addInitScript(()=>localStorage.setItem('perf-save-data','1'));
   let offline=false;
   const attach=page=>{
    page.on('response',r=>{if(offline&&r.status()>=400&&!new URL(r.url()).pathname.startsWith('/api/'))result.failures.push({kind:'http',url:r.url(),status:r.status()});});
    page.on('requestfailed',r=>{if(offline)result.events.push({kind:'requestfailed',url:r.url(),error:r.failure()?.errorText});});
-   page.on('console',m=>{if(offline&&m.type()==='error')result.events.push({kind:'console',message:m.text()});});
+   page.on('console',m=>{if(!offline&&['warning','error'].includes(m.type()))console.log(engine,'install console:',m.text());if(offline&&m.type()==='error')result.events.push({kind:'console',message:m.text()});});
    page.on('pageerror',e=>{if(offline)result.events.push({kind:'pageerror',message:e.message,stack:e.stack});});
   };
   let page=await context.newPage();attach(page);
@@ -40,9 +42,9 @@ async function run(engine){
    const missing=[];for(const [path,file]of Object.entries(manifest.files)){const r=await cache.match(legacy?path:path+'?v='+file.h);if(!r||(!legacy&&r.headers.get('X-Asset-Hash')!==file.h))missing.push(path);}
    return{total:Object.keys(manifest.files).length,missing};
   },{manifest,legacy});
-  const started=Date.now();await boot();await page.evaluate(()=>navigator.serviceWorker.ready);await page.evaluate(()=>window.Lazy?.warm());
+  const started=Date.now();console.log(engine,'install boot');await boot();console.log(engine,'waiting for worker activation');if(!await poll(()=>page.evaluate(async()=>!!(await navigator.serviceWorker.getRegistration())?.active),30000))throw Error('Worker did not activate: '+JSON.stringify(await page.evaluate(async()=>{const r=await navigator.serviceWorker.getRegistration();return {active:r?.active?.state,waiting:r?.waiting?.state,installing:r?.installing?.state,caches:await caches.keys(),keys:(await(await caches.open('ytplayer-assets')).keys()).map(r=>new URL(r.url).pathname)};})));await page.evaluate(()=>navigator.serviceWorker.ready);console.log(engine,'worker active');await page.evaluate(()=>window.Lazy?.warm());
   await poll(async()=>!(await inventory()).missing.length,Number(option('--warm-timeout','15000')));
-  result.installMs=Date.now()-started;result.inventory=await inventory();result.installWire=proxy.getStats();result.saveData=await page.evaluate(()=>navigator.connection?.saveData);
+  console.log(engine,'inventory complete');result.installMs=Date.now()-started;result.inventory=await inventory();result.installWire=proxy.getStats();result.saveData=await page.evaluate(()=>navigator.connection?.saveData);
   if(result.inventory.missing.length)result.failures.push({kind:'incomplete',paths:result.inventory.missing});
   // Offline navigation always starts from a controlled document.
   await page.reload();await page.waitForFunction(()=>typeof data!=='undefined'&&document.querySelector('[aria-label="Car mode"]'));
@@ -56,7 +58,7 @@ async function run(engine){
    await attempt('all lazy groups',()=>page.evaluate(async()=>{if(window.Lazy)for(const [name,group] of Object.entries(Lazy.manifest.groups))if(group.background)await Lazy.load(name);}));
    for(const section of ['piano','midi','floating-lyrics','vocal-reducer','equalizer','setlist-import','broadcast','party-dj','direct-transfer'])await attempt(section,async()=>{await page.evaluate(async()=>{view={type:'settings'};await renderSettings();});await page.waitForSelector('[data-section="'+section+'"]',{timeout:5000,state:'attached'});await page.evaluate(id=>document.querySelector('[data-section="'+id+'"]').click(),section);await page.waitForTimeout(100);});
    await attempt('presenter',async()=>{await page.evaluate(async()=>{history.replaceState(null,'','/?present=');await Presenter.boot();});await page.waitForSelector('#presenterView:not(.hidden)',{timeout:5000});await page.locator('#pvCode').fill('x');await page.locator('#pvPairBtn').click();if(!/6-digit/.test(await page.locator('#pvMsg').textContent()))throw Error('Presenter validation did not run');await page.evaluate(()=>{document.querySelector('#presenterView').classList.add('hidden');document.body.classList.remove('presenter-open');history.replaceState(null,'','/');});});
-   await attempt('video editor',async()=>{await page.evaluate(()=>openVideoEditor({id:'upl_0123456789ab',title:'Offline edit',duration:120}));await page.waitForSelector('.video-editor',{timeout:5000});await page.locator('.ve-from').fill('0:10');await page.locator('.ve-to').fill('0:20');await page.locator('.ve-add').click();if(!/10/.test(await page.locator('.ve-cuts').textContent()))throw Error('Cut was not added');await page.evaluate(()=>closeModal());});
+   await attempt('video editor',async()=>{await page.evaluate(()=>openVideoEditor({id:'upl_0123456789ab',title:'Offline edit',duration:120}));if(!await page.evaluate(()=>window.OPFS?.isSupported())){if(!/Editing needs offline storage/.test(await page.locator('#toastContainer').textContent()))throw Error('Missing unsupported-storage explanation');result.unsupportedFeatures ||= [];if(!result.unsupportedFeatures.includes('video editor: OPFS unavailable in Linux WebKit'))result.unsupportedFeatures.push('video editor: OPFS unavailable in Linux WebKit');return;}await page.waitForSelector('.video-editor',{timeout:5000});await page.locator('.ve-from').fill('0:10');await page.locator('.ve-to').fill('0:20');await page.locator('.ve-add').click();if(!/10/.test(await page.locator('.ve-cuts').textContent()))throw Error('Cut was not added');await page.evaluate(()=>closeModal());});
    await attempt('lyrics editor',async()=>{await page.evaluate(async()=>{data.profile={name:'offline-test'};await Notes.load({id:'abcdefghijk',title:'Offline lyrics'});document.querySelector('#lyricsEditBtn').click();});await page.waitForSelector('.lyr-editor-text',{timeout:5000});await page.locator('.lyr-editor-text').fill('[0:10] Offline lyric');await page.evaluate(()=>closeModal());});
    await attempt('car',async()=>{await page.evaluate(()=>document.querySelector('[aria-label="Car mode"]').click());await page.waitForSelector('.car-mode',{timeout:5000});await page.getByRole('button',{name:'Exit Car mode'}).click();});
    await attempt('remote',async()=>{await page.evaluate(()=>document.querySelector('#navRemoteBtn').click());await page.waitForSelector('#modal:not(.hidden)',{timeout:5000});await page.evaluate(()=>closeModal());});
@@ -81,18 +83,36 @@ async function run(engine){
    const interrupted=await inventory();
    if(!interrupted.missing.length)throw Error('Interruption did not leave missing assets');
    if(engine==='chromium'){const cdp=await context.newCDPSession(page);await cdp.send('ServiceWorker.enable');await cdp.send('ServiceWorker.stopAllWorkers');await cdp.detach();}
-   await page.close();await context.close();
-   await proxy.setOffline(false);
-   context=await type.launchPersistentContext(join(cwd,'profile'),{headless:true});browser=context.browser();await configure();
-   page=await context.newPage();attach(page);await boot();
+   if(engine==='chromium'){
+    await page.close();await context.close();await proxy.setOffline(false);
+    context=await openContext();await configure();page=await context.newPage();attach(page);await boot();
+   }else{
+    // Linux WebKit persistent contexts do not share page/worker CacheStorage.
+    // Exercise a real worker re-registration in the same browser context.
+    await page.evaluate(async()=>{const r=await navigator.serviceWorker.getRegistration();await r.unregister();});
+    await page.close();await proxy.setOffline(false);page=await context.newPage();attach(page);await boot();
+   }
    const other=await context.newPage();await other.goto(origin);await other.waitForSelector('#carModeBtn');
    const complete=await poll(async()=>!(await inventory()).missing.length);
-   result.conditions.push({name:'interrupted job, page closed, browser restarted with same profile, Save-Data, two tabs',interruptedMissing:interrupted.missing.length,complete});
-   if(!complete)result.failures.push({kind:'resume',inventory:await inventory()});
+   result.conditions.push({name:engine==='webkit'?'page closed, worker re-registration, Save-Data, two tabs':'interrupted job, page closed, browser restarted with same profile, Save-Data, two tabs',interruptedMissing:interrupted.missing.length,storageMode:engine==='webkit'?'same-context worker re-registration; Linux WebKit persistent CacheStorage is broken':'persistent disk profile',complete});
+   if(!complete)result.failures.push({kind:'resume',inventory:await inventory(),status:await page.evaluate(async()=>({registration:!!(await navigator.serviceWorker.getRegistration())?.active}))});
    // Evict one optional file and require the online event alone to restart work.
    const path='/piano-engine.mjs';await page.evaluate(async({path,manifest})=>{await(await caches.open('ytplayer-assets')).delete(path+'?v='+manifest.files[path].h);localStorage.removeItem('perf-save-data');window.dispatchEvent(new Event('online'));},{path,manifest});
    const onlineResume=await poll(async()=>!(await inventory()).missing.length);result.conditions.push({name:'online event, Save-Data off',complete:onlineResume});if(!onlineResume)result.failures.push({kind:'online-resume'});
-   await other.close();
+   if(engine==='chromium'){
+    await sleep(100);await proxy.setOffline(true);
+    await context.route('**/admin.html?offline-inspector=1',route=>route.fulfill({contentType:'text/html',body:'<!doctype html><title>Cache inspector</title>'}));
+    const inspector=await context.newPage();await inspector.goto(origin+'/admin.html?offline-inspector=1');const cdp=await context.newCDPSession(inspector);
+    const {caches:names}=await cdp.send('CacheStorage.requestCacheNames',{securityOrigin:origin});
+    const cacheId=names.find(c=>c.cacheName==='ytplayer-assets').cacheId;
+    await page.evaluate(async manifest=>{const c=await caches.open('ytplayer-assets');for(const path of Object.keys(manifest.files).filter(p=>manifest.files[p].g!=='core'))await c.delete(path+'?v='+manifest.files[path].h);navigator.serviceWorker.controller.postMessage({type:'COMPLETE_ASSETS'});},manifest);
+    await poll(()=>page.evaluate(async()=>{const c=await caches.open('ytplayer-assets'),s=await(await c.match('/__ytp_asset_state')).json(),r=await c.match('/__ytp_completion/'+s.current.buildTag);return r&&(await r.json()).running;}),5000);
+    await page.close();await other.close();await proxy.setOffline(false);
+    const withoutPage=await poll(async()=>{const {cacheDataEntries:entries}=await cdp.send('CacheStorage.requestEntries',{cacheId,skipCount:0,pageSize:1000});return Object.entries(manifest.files).every(([path,file])=>entries.some(e=>e.requestURL===origin+path+'?v='+file.h&&e.responseHeaders.some(h=>h.name.toLowerCase()==='x-asset-hash'&&h.value===file.h)));});
+    result.conditions.push({name:'worker completes with every application page closed; passive same-origin inspector only',complete:withoutPage});
+    if(!withoutPage)result.failures.push({kind:'completion-without-page'});
+    await cdp.detach();await inspector.close();
+   }else await other.close();
   }
   console.log(engine,JSON.stringify({missing:result.inventory.missing,failures:result.failures,conditions:result.conditions}));
  }catch(e){result.failures.push({kind:'harness',error:e.stack});console.log(engine,e.message);}finally{await context?.close();await browser?.close();await proxy?.close();child.kill('SIGTERM');if(child.exitCode===null)await new Promise(r=>child.once('exit',r));}