fix(release): refuse to gate or record against a foreign acceptance server

A leftover checkout answering on 127.0.0.1:4173 satisfied the readiness probe,
so every acceptance flow and the recorded demo described another tree while the
build reported green. The builder now fails closed if the port already has a
listener, re-checks the spawned server after readiness, and verifies the served
app.js and src/domain.js bytes match the clone under test before the first gate.

Verified against a real stale tree: the occupied-port guard aborts, the
foreign-bytes guard aborts, and the matching tree still passes.

.gitea/workflows/quality.yml

@@ -59,6 +59,8 @@ jobs:
           npm run test:worker-readiness
           npm run test:pattern-summary
           npm run test:photo-lifecycle
+          npm run test:training-contribution
+          npm run test:portability
       - name: Dependency audit
         run: npm audit --audit-level=high
       - name: Syntax checks

README.md

@@ -122,7 +122,7 @@ npm audit --audit-level=high
 - A committed CC0 synthetic vision corpus that continuously proves every reply is schema-valid or fails closed. A schema-valid reply with no readable form or colour now **abstains** ("No confident match") instead of surfacing as a worker failure, and unparsable or out-of-range replies return plain copy — "No suggestion was applied. Continue manually, or try a clearer photo." — with no provider text, image bytes, or credentials echoed. See [tests/fixtures/vision-corpus](tests/fixtures/vision-corpus/README.md)
 - Unsaved logging drafts are retained in the session with an explicit start over, and the service worker never caches analysis requests or image bodies
 - Private photo lifecycle: a confirmed log reports a saved photo as a label rather than a thumbnail, showing the image is an explicit request, removing the photo keeps every confirmed field, deleting a log is a separate two-step decision, and delete-all removes the ledger and every stored photo together
-- Local browser ledger, calendar, pattern summary, JSON portability, and delete-all
+- Local browser ledger, calendar, pattern summary, versioned JSON backup (logs, training receipts, and per-log AI provenance) with safe upgrade/refusal on import, and delete-all
 - Explainable pattern summaries: the home insight card reports the confirmed-log count and form groupings for the last 28 days, every line names the exact confirmed records behind it, following a citation opens those records, and a window below the minimum says it is too sparse instead of describing a trend. No line explains a cause, rules on food, or offers a health verdict
 - Installable/offline PWA shell for the manual and saved-ledger paths
 

app.js

@@ -1,4 +1,4 @@
-import { bucketForBristolType, detectUrgentFlags, detectUrgentText, exportLedger, hasUrgentLedgerContext, importLedger, photoQualityMessage, sanitizeEntry, urgentChatMessage } from './src/domain.js';
+import { bucketForBristolType, detectUrgentFlags, detectUrgentText, exportLedgerBackup, LEDGER_EXPORT_VERSION, hasUrgentLedgerContext, importLedgerBackup, photoQualityMessage, sanitizeEntry, urgentChatMessage } from './src/domain.js';
 import { mergeVisualSuggestion } from './src/analysis.js';
 import { createDraft, draftNotice, isDraftDirty } from './src/draft.js';
 import { changeVisualField, confirmSuggestion, createSuggestionState, provenanceCopy } from './src/suggestion.js';
@@ -7,6 +7,7 @@ import { visionReadiness } from './src/vision-readiness.js';
 import { buildPatternSummary } from './src/summary.js';
 import { answerFromLedger, buildChatLedger, resolveAgentReply } from './src/grounded-chat.js';
 import { photoState, withoutEntry, withoutPhoto } from './src/photo-lifecycle.js';
+import { addContribution, consentTerms, contributionEligibility, contributionForEntry, receiptPreview, withdrawContribution } from './src/training-contribution.js';
 
 const runtimeConfig = {
   basePath: document.querySelector('meta[name="timmy-base-path"]')?.content || '/',
@@ -16,6 +17,7 @@ const BASE_PATH = runtimeConfig.basePath || '/';
 const APP_ROOT = BASE_PATH === '/' ? '/' : `${BASE_PATH}/`;
 function appPath(path='') { return `${APP_ROOT}${String(path).replace(/^\/+/, '')}`; }
 const STORE = `timmy:${BASE_PATH}:ledger-v1`;
+const TRAINING_STORE = `timmy:${BASE_PATH}:training-contributions-v1`;
 const LEGACY_STORE = 'timmy-ledger-v1';
 if (BASE_PATH === '/') {
   const legacyEntries = localStorage.getItem(LEGACY_STORE);
@@ -28,6 +30,7 @@ if (BASE_PATH === '/') {
 }
 const app = document.querySelector('#app');
 let entries = loadEntries();
+let contributions = loadContributions();
 let view = 'home';
 let photoHint = '';
 let aiSuggestion = null;
@@ -39,6 +42,10 @@ let chatBusy = false;
 let chatError = '';
 let chatMessages = [{ role: 'timmy', text: 'Ask me about your confirmed logs, visible patterns, privacy, or how Timmy works.' }];
 let draftResumed = false;
+// Issue #35 — importing a backup reports which version the file came from and what changed, and a
+// refused file leaves the ledger exactly as it was. The notice is state, not a toast, because a
+// message that disappears in two seconds cannot tell anyone whether their records were replaced.
+let portabilityNotice = null;
 let form = createDraft();
 let followUpAnswers = createFollowUpAnswers();
 
@@ -86,6 +93,10 @@ function refreshFollowUp(){
 function esc(value='') { return String(value).replace(/[&<>'"]/g, c => ({'&':'&amp;','<':'&lt;','>':'&gt;',"'":'&#39;','"':'&quot;'}[c])); }
 function loadEntries() { try { return JSON.parse(localStorage.getItem(STORE) || '[]'); } catch { return []; } }
 function saveEntries() { localStorage.setItem(STORE, JSON.stringify(entries)); }
+// Training contribution receipts are their own store: a journal save never writes here, and a
+// withdrawal keeps a tombstone instead of quietly erasing the audit trail.
+function loadContributions() { try { return JSON.parse(localStorage.getItem(TRAINING_STORE) || '[]'); } catch { return []; } }
+function saveContributions() { localStorage.setItem(TRAINING_STORE, JSON.stringify(contributions)); }
 function formatDate(value) { return new Intl.DateTimeFormat(undefined,{month:'short',day:'numeric',hour:'numeric',minute:'2-digit'}).format(new Date(value)); }
 function toast(message) { const node=document.createElement('div');node.className='toast';node.textContent=message;document.body.append(node);setTimeout(()=>node.remove(),2400); }
 
@@ -101,6 +112,8 @@ function bindGlobal(){
   document.querySelectorAll('[data-scan]').forEach(btn=>btn.onclick=openPhotoFirst);
   document.querySelectorAll('[data-statement-link]').forEach(btn=>btn.onclick=()=>showPatternRecords(btn.dataset.statementLink));
   document.querySelectorAll('[data-entry-open]').forEach(btn=>btn.onclick=()=>showEntrySheet(btn.dataset.entryOpen));
+  document.querySelectorAll('[data-contribute-entry]').forEach(btn=>btn.onclick=()=>showContributionConsent(btn.dataset.contributeEntry));
+  document.querySelectorAll('[data-withdraw]').forEach(btn=>btn.onclick=()=>withdrawTrainingContribution(btn.dataset.withdraw));
 }
 
 function recentList(limit=5){
@@ -122,7 +135,7 @@ function showEntrySheet(id, armed=false){
   const urgent=detectUrgentFlags(entry.symptoms);
   document.querySelector('.sheet-backdrop')?.remove();
   const wrap=document.createElement('div');wrap.className='sheet-backdrop';
-  wrap.innerHTML=`<section class="sheet" role="dialog" aria-modal="true" aria-labelledby="entry-sheet-title"><div class="sheet-handle"></div><div class="sheet-header"><div><span class="eyebrow">Confirmed log</span><h2 id="entry-sheet-title">${formatDate(entry.occurredAt)}</h2></div><button class="icon-btn" id="entry-sheet-close" aria-label="Close">×</button></div><div class="entry-facts"><div><span>Form</span><strong>Type ${entry.bristolType}</strong></div><div><span>Color</span><strong>${esc(entry.color)}</strong></div><div><span>Urgency</span><strong>${entry.urgency}/4</strong></div><div><span>Discomfort</span><strong>${entry.discomfort}/4</strong></div></div>${entry.note?`<p class="fine entry-note">${esc(entry.note)}</p>`:''}${urgent.urgent?alertHtml(urgent.message):''}${photo.hasPhoto?`<section class="photo-lifecycle" data-photo-lifecycle="present"><strong>Photo saved with this log</strong><p class="fine">The image stays in this browser. The journal never shows it as a thumbnail until you ask.</p><div id="entry-photo-slot"></div><div class="row"><button class="btn btn-secondary" id="show-entry-photo">Show photo</button><button class="btn btn-ghost" id="remove-entry-photo">Remove photo, keep log</button></div></section>`:`<section class="photo-lifecycle" data-photo-lifecycle="absent"><strong>No photo saved</strong><p class="fine">This confirmed log is text only. Its record does not depend on an image.</p></section>`}<div class="entry-actions">${armed?`<button class="btn btn-danger btn-wide" id="delete-entry-confirm">Tap again to delete this log and its photo</button><p class="fine">This removes the confirmed log and its saved photo from this browser. It cannot be undone.</p>`:`<button class="btn btn-ghost btn-wide" id="delete-entry">Delete this log and its photo</button>`}</div></section>`;
+  wrap.innerHTML=`<section class="sheet" role="dialog" aria-modal="true" aria-labelledby="entry-sheet-title"><div class="sheet-handle"></div><div class="sheet-header"><div><span class="eyebrow">Confirmed log</span><h2 id="entry-sheet-title">${formatDate(entry.occurredAt)}</h2></div><button class="icon-btn" id="entry-sheet-close" aria-label="Close">×</button></div><div class="entry-facts"><div><span>Form</span><strong>Type ${entry.bristolType}</strong></div><div><span>Color</span><strong>${esc(entry.color)}</strong></div><div><span>Urgency</span><strong>${entry.urgency}/4</strong></div><div><span>Discomfort</span><strong>${entry.discomfort}/4</strong></div></div>${entry.note?`<p class="fine entry-note">${esc(entry.note)}</p>`:''}${entry.provenance?`<p class="fine entry-provenance" data-entry-provenance="${esc(entry.provenance.source)}">${esc(entry.provenance.source==='ai-corrected'?'Saved from an AI suggestion you corrected. Your values are stored, not the model’s.':'Saved from an AI suggestion you confirmed: visible form and color only, never a diagnosis.')}${entry.provenance.model?` Model: ${esc(entry.provenance.model)}.`:''}</p>`:''}${urgent.urgent?alertHtml(urgent.message):''}${photo.hasPhoto?`<section class="photo-lifecycle" data-photo-lifecycle="present"><strong>Photo saved with this log</strong><p class="fine">The image stays in this browser. The journal never shows it as a thumbnail until you ask.</p><div id="entry-photo-slot"></div><div class="row"><button class="btn btn-secondary" id="show-entry-photo">Show photo</button><button class="btn btn-ghost" id="remove-entry-photo">Remove photo, keep log</button></div></section>`:`<section class="photo-lifecycle" data-photo-lifecycle="absent"><strong>No photo saved</strong><p class="fine">This confirmed log is text only. Its record does not depend on an image.</p></section>`}<div class="entry-actions">${armed?`<button class="btn btn-danger btn-wide" id="delete-entry-confirm">Tap again to delete this log and its photo</button><p class="fine">This removes the confirmed log and its saved photo from this browser. It cannot be undone.</p>`:`<button class="btn btn-ghost btn-wide" id="delete-entry">Delete this log and its photo</button>`}</div></section>`;
   document.body.append(wrap);
   if(entrySheetKeyHandler)document.removeEventListener('keydown',entrySheetKeyHandler);
   const close=()=>{wrap.remove();document.removeEventListener('keydown',onKey);if(entrySheetKeyHandler===onKey)entrySheetKeyHandler=null};
@@ -245,13 +258,68 @@ async function sendChat(event){
  finally{chatBusy=false;timmy()}
 }
 
+// Issue #24 — contributing a confirmed photo to training is a second, separate consent. A journal
+// save writes nothing here, the consent version and the receipt are on screen before the confirm
+// control can be pressed, and a withdrawal keeps a tombstone naming every derived artifact by
+// contribution id. Nothing is transmitted in this build: the receipt is queued on the device.
+function newContributionId(){
+  const raw=globalThis.crypto?.randomUUID?.()||`${Date.now().toString(16)}${Math.random().toString(16).slice(2)}`;
+  return `contrib-${String(raw).replace(/[^a-z0-9]/gi,'').slice(0,12)}`;
+}
+function trainingConsentSection(){
+  const terms=consentTerms();
+  const queued=contributions.filter(receipt=>receipt.state!=='withdrawn').length;
+  const active=contributions.filter(receipt=>receipt.state!=='withdrawn').map(receipt=>`<div class="contribution-row" data-contribution-state="${esc(receipt.state)}"><div><strong>Type ${receipt.labels.bristolType} · ${esc(receipt.labels.color)}</strong><span>Receipt ${esc(receipt.contributionId)} · consent ${esc(receipt.consentVersion)}</span></div><button class="btn btn-ghost" data-withdraw="${esc(receipt.contributionId)}">Withdraw</button></div>`);
+  const offerable=entries.filter(entry=>contributionEligibility(entry).eligible&&!contributions.some(receipt=>receipt.entryId===entry.id)).map(entry=>`<div class="contribution-row"><div><strong>${formatDate(entry.occurredAt)}</strong><span>Type ${entry.bristolType} · photo saved</span></div><button class="btn btn-secondary" data-contribute-entry="${esc(entry.id)}">Review opt-in</button></div>`);
+  const tombstones=contributions.filter(receipt=>receipt.state==='withdrawn').map(receipt=>`<div class="contribution-row withdrawn" data-contribution-state="withdrawn"><div><strong>Withdrawn ${esc(formatDate(receipt.withdrawnAt))}</strong><span data-withdrawn-artifacts>raw image, confirmed label · receipt ${esc(receipt.contributionId)}</span></div></div>`);
+  const rows=[...active,...offerable].join('');
+  return `<section class="section card training-consent" data-training-consent><h2>Training contribution</h2><p class="fine">Off by default. Saving a log never contributes it, and nothing is uploaded in this build — a receipt is queued on this device.</p><p class="fine">Consent version <code data-contribution-consent-version>${esc(terms.version)}</code> · <span data-contribution-queued-count>${queued}</span> queued</p>${rows?`<div class="contribution-list">${rows}</div>`:'<p class="fine">No saved photos are available to contribute yet.</p>'}${tombstones.length?`<h3>Withdrawn receipts</h3>${tombstones.join('')}`:''}<p class="fine">Deleting all local data below also clears these receipts.</p></section>`;
+}
+let contributionSheetKeyHandler=null;
+function showContributionConsent(entryId){
+  const entry=entries.find(item=>item.id===entryId);
+  const eligibility=contributionEligibility(entry);
+  if(!eligibility.eligible){toast(eligibility.reason||'This log cannot be contributed.');return}
+  if(contributionForEntry(contributions,entryId)){toast('This log already has an active contribution receipt.');return}
+  const terms=consentTerms();
+  const contributionId=newContributionId();
+  const consentedAt=new Date().toISOString();
+  document.querySelector('.sheet-backdrop')?.remove();
+  const wrap=document.createElement('div');wrap.className='sheet-backdrop';
+  wrap.innerHTML=`<section class="sheet" role="dialog" aria-modal="true" aria-labelledby="contribution-title" data-contribution-sheet><div class="sheet-handle"></div><div class="sheet-header"><div><span class="eyebrow">Separate consent</span><h2 id="contribution-title">Contribute one photo?</h2></div><button class="icon-btn" id="contribution-cancel" aria-label="Close">×</button></div><div class="consent-card"><p class="fine">Consent version <code data-contribution-version>${esc(terms.version)}</code></p><p class="fine">Receipt <code data-receipt-id>${esc(contributionId)}</code> · ${esc(formatDate(consentedAt))}</p><p class="fine"><strong>Included:</strong> ${esc(terms.includes.join('; '))}.</p><p class="fine"><strong>Never included:</strong> ${esc(terms.excludes.join('; '))}.</p><p class="fine">${esc(terms.transport)}</p></div><label class="check"><input id="training-consent-check" type="checkbox"><span>I have read consent ${esc(terms.version)} and want this one log contributed.</span></label><button class="btn btn-primary btn-wide" id="contribute-confirm" disabled>Contribute this photo and label</button><button class="btn btn-ghost btn-wide section" id="contribution-cancel-bottom">Not now</button></section>`;
+  document.body.append(wrap);
+  if(contributionSheetKeyHandler)document.removeEventListener('keydown',contributionSheetKeyHandler);
+  const close=()=>{wrap.remove();document.removeEventListener('keydown',onKey);if(contributionSheetKeyHandler===onKey)contributionSheetKeyHandler=null};
+  const onKey=event=>{if(event.key==='Escape')close()};
+  contributionSheetKeyHandler=onKey;
+  document.addEventListener('keydown',onKey);
+  document.querySelector('#contribution-cancel').onclick=close;
+  document.querySelector('#contribution-cancel-bottom').onclick=close;
+  wrap.onclick=event=>{if(event.target===wrap)close()};
+  const check=document.querySelector('#training-consent-check'),confirm=document.querySelector('#contribute-confirm');
+  check.onchange=()=>{confirm.disabled=!check.checked};
+  confirm.onclick=()=>{
+    try{
+      contributions=addContribution(contributions,receiptPreview(entry,{contributionId,consentedAt}));
+      saveContributions();close();render();toast('Queued on this device. Nothing was uploaded.');
+    }catch(error){toast(error.message||'That receipt could not be recorded.')}
+  };
+}
+function withdrawTrainingContribution(contributionId){
+  const result=withdrawContribution(contributions,contributionId,new Date().toISOString());
+  if(!result.tombstone){toast('That contribution receipt was not found.');return}
+  contributions=result.contributions;saveContributions();render();toast('Contribution withdrawn. The receipt is kept as a tombstone.');
+  return result.tombstone;
+}
+
 function privacy(){
-  shell(`<main><div class="page-title"><span class="eyebrow">Private by design</span><h1>Your poop. Your phone.</h1><p>This prototype has no account, analytics, ad tracker, or server database.</p></div><section class="card privacy-list"><div class="privacy-item"><b>⌂</b><div><h3>Stored locally</h3><p>Saved entries and optional photos live in this browser’s local storage. You can remove one photo without deleting its confirmed log.</p></div></div><div class="privacy-item"><b>⇩</b><div><h3>Portable</h3><p>Export a readable JSON file. Import it in another copy of Timmy.</p></div></div><div class="privacy-item"><b>◎</b><div><h3>AI only when you ask</h3><p>Manual logging never uploads. Analyze a photo sends one compressed copy after consent. Hermes chat may receive up to 20 confirmed text-only entries after you connect; photos and backend credentials never enter chat.</p></div></div></section><section class="section card"><h2>Data controls</h2><div class="row"><button class="btn btn-primary" id="export">Export JSON</button><label class="btn btn-secondary" for="import">Import JSON</label><input class="hidden" type="file" id="import" accept="application/json"></div><p class="fine section">Exports can contain sensitive health notes and photos. Store them somewhere you trust.</p></section><section class="section card source-list"><h2>Health sources</h2><p class="fine">The Bristol groupings and urgent-symptom copy are grounded in public clinical guidance.</p><p><a target="_blank" rel="noreferrer" href="https://www.continence.org.au/about-incontinence/bowel-incontinence/bristol-stool-chart/">Continence Health Australia</a></p><p><a target="_blank" rel="noreferrer" href="https://www.nhs.uk/conditions/bleeding-from-the-bottom-rectal-bleeding/">NHS rectal bleeding guidance</a></p><p><a target="_blank" rel="noreferrer" href="https://www.niddk.nih.gov/health-information/digestive-diseases/constipation/symptoms-causes">NIDDK constipation guidance</a></p></section><section class="section card danger-zone"><h2>Delete everything</h2><p class="fine">Permanently removes Timmy’s local ledger and every saved photo from this browser.</p><button class="btn btn-danger" id="delete-all">Delete all local data</button></section></main>`);
+  shell(`<main><div class="page-title"><span class="eyebrow">Private by design</span><h1>Your poop. Your phone.</h1><p>This prototype has no account, analytics, ad tracker, or server database.</p></div><section class="card privacy-list"><div class="privacy-item"><b>⌂</b><div><h3>Stored locally</h3><p>Saved entries and optional photos live in this browser’s local storage. You can remove one photo without deleting its confirmed log.</p></div></div><div class="privacy-item"><b>⇩</b><div><h3>Portable</h3><p>Export a readable JSON file. Import it in another copy of Timmy.</p></div></div><div class="privacy-item"><b>◎</b><div><h3>AI only when you ask</h3><p>Manual logging never uploads. Analyze a photo sends one compressed copy after consent. Hermes chat may receive up to 20 confirmed text-only entries after you connect; photos and backend credentials never enter chat.</p></div></div></section><section class="section card"><h2>Data controls</h2><div class="row"><button class="btn btn-primary" id="export">Export JSON</button><label class="btn btn-secondary" for="import">Import JSON</label><input class="hidden" type="file" id="import" accept="application/json"></div><p class="fine section">Exports can contain sensitive health notes and photos. Store them somewhere you trust.</p></section>${portabilityNoticeBlock()}${trainingConsentSection()}<section class="section card source-list"><h2>Health sources</h2><p class="fine">The Bristol groupings and urgent-symptom copy are grounded in public clinical guidance.</p><p><a target="_blank" rel="noreferrer" href="https://www.continence.org.au/about-incontinence/bowel-incontinence/bristol-stool-chart/">Continence Health Australia</a></p><p><a target="_blank" rel="noreferrer" href="https://www.nhs.uk/conditions/bleeding-from-the-bottom-rectal-bleeding/">NHS rectal bleeding guidance</a></p><p><a target="_blank" rel="noreferrer" href="https://www.niddk.nih.gov/health-information/digestive-diseases/constipation/symptoms-causes">NIDDK constipation guidance</a></p></section><section class="section card danger-zone"><h2>Delete everything</h2><p class="fine">Permanently removes Timmy’s local ledger and every saved photo from this browser.</p><button class="btn btn-danger" id="delete-all">Delete all local data</button></section></main>`);
   document.querySelector('#export').onclick=exportData;document.querySelector('#import').onchange=importData;document.querySelector('#delete-all').onclick=deleteData;
 }
-function exportData(){const blob=new Blob([exportLedger(entries)],{type:'application/json'}),a=document.createElement('a');a.href=URL.createObjectURL(blob);a.download='timmy-ledger.json';a.click();URL.revokeObjectURL(a.href);toast('Export created');}
-async function importData(e){try{const text=await e.target.files[0].text();entries=importLedger(text);saveEntries();render();toast('Ledger imported')}catch(err){toast(err.message)}}
-function deleteData(){if(confirm('Delete every local Timmy entry and photo? This cannot be undone.')){entries=[];localStorage.removeItem(STORE);localStorage.removeItem(LEGACY_STORE);render();toast('Local ledger and photos deleted')}}
+function exportData(){const blob=new Blob([exportLedgerBackup({entries,contributions})],{type:'application/json'}),a=document.createElement('a');a.href=URL.createObjectURL(blob);a.download=`timmy-backup-v${LEDGER_EXPORT_VERSION}.json`;a.click();URL.revokeObjectURL(a.href);portabilityNotice={kind:'ok',version:LEDGER_EXPORT_VERSION,text:`Backup written as version ${LEDGER_EXPORT_VERSION}: ${entries.length} log${entries.length===1?'':'s'} and ${contributions.length} training receipt${contributions.length===1?'':'s'}.`};render();toast('Backup exported');}
+async function importData(e){const file=e.target.files?.[0];if(!file)return;try{const result=importLedgerBackup(await file.text());entries=result.entries;contributions=result.contributions;saveEntries();saveContributions();portabilityNotice={kind:'ok',version:result.fromVersion,text:[`Restored ${result.entries.length} log${result.entries.length===1?'':'s'} and ${result.contributions.length} training receipt${result.contributions.length===1?'':'s'} from a version ${result.fromVersion} backup.`,...result.notices].join(' ')};e.target.value='';render();toast('Backup imported')}catch(err){portabilityNotice={kind:'error',text:`${err.message||'That backup could not be read.'} Your ledger is unchanged.`};e.target.value='';render();toast('Nothing was imported')}}
+function portabilityNoticeBlock(){if(!portabilityNotice)return '';if(portabilityNotice.kind==='error')return `<p class="portability-notice error" role="alert" data-portability-error>${esc(portabilityNotice.text)}</p>`;return `<p class="portability-notice" role="status" data-portability-notice data-portability-version="${esc(String(portabilityNotice.version))}">${esc(portabilityNotice.text)}</p>`}
+function deleteData(){if(confirm('Delete every local Timmy entry and photo? This cannot be undone.')){entries=[];contributions=[];portabilityNotice=null;localStorage.removeItem(STORE);localStorage.removeItem(LEGACY_STORE);localStorage.removeItem(TRAINING_STORE);render();toast('Local ledger and photos deleted')}}
 
 function openPhotoFirst(){beginDraft();photoHint='';resetSuggestion();visionStatus=null;showPhotoFirst('pick');loadVisionStatus()}
 async function loadVisionStatus(){
@@ -308,7 +376,21 @@ function bindStep(step){
 }
 async function handlePhoto(e){const file=e.target.files[0];if(!file)return;try{const result=await compressPhoto(file);form.photoDataUrl=result.dataUrl;photoHint=photoQualityMessage(result);showLogStep(2)}catch{photoHint='That image could not be read. Try another photo.';showLogStep(2)}}
 function compressPhoto(file){return new Promise((resolve,reject)=>{const img=new Image(),url=URL.createObjectURL(file);img.onload=()=>{const scale=Math.min(1,1200/Math.max(img.width,img.height)),canvas=document.createElement('canvas');canvas.width=Math.round(img.width*scale);canvas.height=Math.round(img.height*scale);const ctx=canvas.getContext('2d');ctx.drawImage(img,0,0,canvas.width,canvas.height);const sample=ctx.getImageData(0,0,Math.min(canvas.width,120),Math.min(canvas.height,120)).data;let total=0;for(let i=0;i<sample.length;i+=4)total+=(sample[i]+sample[i+1]+sample[i+2])/3;URL.revokeObjectURL(url);resolve({dataUrl:canvas.toDataURL('image/jpeg',.7),width:img.width,height:img.height,brightness:total/(sample.length/4)/255})};img.onerror=()=>{URL.revokeObjectURL(url);reject()};img.src=url})}
-function saveLog(){const result=detectUrgentFlags(form.symptoms);const entry=sanitizeEntry({...form});try{entries.push(entry);saveEntries()}catch{entry.photoDataUrl='';entries[entries.length-1]=entry;saveEntries();toast('Log saved, but the photo was too large for browser storage')}clearDraft();document.querySelector('.sheet-backdrop')?.remove();view='home';render();toast(result.urgent?'Saved. Please follow the medical-care alert.':'Private log saved')}
+// Issue #35 — if this log began as an AI suggestion, the saved record says so. The fields are
+// limited to what the app actually knows (which visible fields were suggested, whether they were
+// confirmed or corrected, and which model answered), so a backup cannot be read as a diagnosis or a
+// broader claim than the visual suggestion the person accepted.
+function provenanceForSave(){
+  const status=suggestionState?.status;
+  if(status!=='confirmed'&&status!=='corrected')return null;
+  const suggestion=suggestionState.suggestion;
+  if(!suggestion)return null;
+  const provenance={source:status==='confirmed'?'ai-confirmed':'ai-corrected',suggestedBristolType:suggestion.bristolType,suggestedColor:suggestion.color,confirmedAt:new Date().toISOString()};
+  const model=typeof visionStatus?.model==='string'?visionStatus.model.trim():'';
+  if(model)provenance.model=model.slice(0,80);
+  return provenance;
+}
+function saveLog(){const result=detectUrgentFlags(form.symptoms);const entry=sanitizeEntry({...form,provenance:provenanceForSave()});try{entries.push(entry);saveEntries()}catch{entry.photoDataUrl='';entries[entries.length-1]=entry;saveEntries();toast('Log saved, but the photo was too large for browser storage')}clearDraft();document.querySelector('.sheet-backdrop')?.remove();view='home';render();toast(result.urgent?'Saved. Please follow the medical-care alert.':'Private log saved')}
 function render(){({home,calendar,timmy,privacy}[view]||home)()}
 
 render();

docs/PRODUCT-DECISIONS.md

@@ -34,6 +34,14 @@ The application’s deterministic urgent-symptom guidance runs before chat and r
 
 Logging must never depend on AI availability. When the vision worker is offline, disabled, or still unknown, the photo-first flow offers no AI action and no analysis-consent prompt, and manual Bristol entry remains one action away from every photo step. A chosen photo and any entered context are retained as an in-session draft with a visible summary and an explicit start over; drafts are deliberately not persisted to storage, so a photo awaiting consent is never written to disk. The service worker never caches analysis requests or image bodies.
 
+### Training contribution consent
+
+Contributing a confirmed photo to training is a second consent, not a side effect of logging. A journal save is never a training contribution; a contribution exists only after the person reads the current consent version and its receipt (contribution id, what is included, what is never included) and accepts it explicitly. The receipt carries the consent version it was accepted under, the confirmed Bristol form and broad color, and no note text, symptom answers, urgency/discomfort ratings, identity, or photo bytes.
+
+Withdrawal is first-class: withdrawal keeps a tombstone naming every derived artifact by contribution id (raw image and confirmed label), so a deletion request can be addressed against the corpus rather than trusted to a promise. Delete-all clears the ledger, saved photos, and contribution receipts together.
+
+This build acknowledges that records the intent and does not transmit a contribution until the corpus pipeline and privacy copy are reviewed in #22 and #25; the section says so in the app rather than implying an upload that does not exist.
+
 ### Release authority
 
 Hermes/Timmy is the release authority for routine engineering, test, build, deployment, and release-candidate preparation. Automated evidence must remain reproducible and must not overstate model accuracy or safety.
@@ -48,6 +56,16 @@ Human gates are limited to:
 
 Routine provisioning, deployment, label sweeps, and release-candidate assembly are not human-operated gates.
 
+### Backup portability and entry provenance
+
+A backup is the person's own record and must keep working as the AI fields evolve.
+
+- Every export stamps a schema version (currently version 2). The same file carries the confirmed logs and the training contribution receipts, including withdrawn tombstones.
+- An older backup is upgraded on import, and the app says which version the file came from. Fields that did not exist when the file was written are left empty rather than invented.
+- A backup from a newer version is refused with an instruction to update Timmy, and a refused import leaves the ledger unchanged.
+- Malformed, oversized, and over-limit files fail before anything is replaced.
+- Provenance is stored on the confirmed log when a saved entry began as a confirmed or corrected AI suggestion: source, suggested visible fields, the model that answered, and when it was confirmed. It never records a diagnosis, a symptom, or provider credentials, and backups are written through an allowlist so unknown keys never leave the device.
+
 ## Consequences
 
 - Model output is assistive and fail-closed, never authoritative.

package.json

@@ -4,7 +4,7 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "test": "node --test tests/domain.test.js tests/analysis.test.js tests/vision-service.test.js tests/vision-config.test.js tests/draft.test.js tests/suggestion.test.js tests/followup.test.js tests/vision-readiness.test.js tests/hermes-agent-service.test.js tests/agent-gateway.acceptance.test.js tests/staging-health.test.js tests/service-worker-runtime.test.js tests/training-ingest.test.js tests/ci-workflow.test.js tests/product-decisions.test.js tests/release-demo.test.js tests/selfhost-bootstrap.test.js tests/staging-config.test.js tests/threat-model.test.js tests/vision-corpus.test.js tests/vision-boundary.test.js tests/worker-benchmark.test.js tests/worker-ready.test.js tests/worker-container.test.js tests/summary.test.js tests/escalation-regression.test.js tests/grounded-chat.test.js tests/photo-lifecycle.test.js",
+    "test": "node --test tests/domain.test.js tests/analysis.test.js tests/vision-service.test.js tests/vision-config.test.js tests/draft.test.js tests/suggestion.test.js tests/followup.test.js tests/vision-readiness.test.js tests/hermes-agent-service.test.js tests/agent-gateway.acceptance.test.js tests/staging-health.test.js tests/service-worker-runtime.test.js tests/training-ingest.test.js tests/ci-workflow.test.js tests/product-decisions.test.js tests/release-demo.test.js tests/selfhost-bootstrap.test.js tests/staging-config.test.js tests/threat-model.test.js tests/vision-corpus.test.js tests/vision-boundary.test.js tests/worker-benchmark.test.js tests/worker-ready.test.js tests/worker-container.test.js tests/summary.test.js tests/escalation-regression.test.js tests/grounded-chat.test.js tests/photo-lifecycle.test.js tests/training-contribution.test.js tests/portability.test.js",
     "test:ui": "node tests/ui.acceptance.mjs",
     "test:photo": "node tests/photo-first.acceptance.mjs",
     "test:mobile-capture": "node tests/mobile-capture.acceptance.mjs",
@@ -17,10 +17,12 @@
     "test:pattern-summary": "node tests/pattern-summary.acceptance.mjs",
     "test:grounded-chat": "node tests/grounded-chat.acceptance.mjs",
     "test:photo-lifecycle": "node tests/photo-lifecycle.acceptance.mjs",
-    "check:syntax": "node --check app.js && node --check server.mjs && node --check service-worker.js && node --check src/analysis.js && node --check src/domain.js && node --check src/draft.js && node --check src/suggestion.js && node --check src/followup.js && node --check src/vision-readiness.js && node --check src/hermes-agent-service.js && node --check src/vision-config.js && node --check src/vision-service.js && node --check src/vision-corpus.js && node --check src/summary.js && node --check src/photo-lifecycle.js && node --check src/grounded-chat.js && node --check scripts/record_release_demo.mjs && node --check tests/staging.acceptance.mjs && node --check tests/manual-fallback.acceptance.mjs && node --check tests/provisional-suggestion.acceptance.mjs && node --check tests/followup.acceptance.mjs && node --check tests/vision-refusal.acceptance.mjs && bash -n scripts/bootstrap_selfhost_smolvlm.sh && bash -n scripts/run_selfhost_smolvlm.sh && python3 -m py_compile scripts/ingest_training_photo.py scripts/build_release.py scripts/deploy_staging.py scripts/build_vision_corpus.py && node --check scripts/record_worker_benchmark.mjs && node --check tests/worker-readiness.acceptance.mjs && node --check tests/pattern-summary.acceptance.mjs && node --check tests/photo-lifecycle.acceptance.mjs && node --check tests/grounded-chat.acceptance.mjs && bash -n scripts/worker_ready.sh && bash -n deploy/worker/entrypoint.sh && bash -n deploy/worker/build_image.sh && bash -n deploy/worker/run_worker_container.sh",
+    "test:training-contribution": "node tests/training-contribution.acceptance.mjs",
+    "check:syntax": "node --check app.js && node --check server.mjs && node --check service-worker.js && node --check src/analysis.js && node --check src/domain.js && node --check src/draft.js && node --check src/suggestion.js && node --check src/followup.js && node --check src/vision-readiness.js && node --check src/hermes-agent-service.js && node --check src/vision-config.js && node --check src/vision-service.js && node --check src/vision-corpus.js && node --check src/summary.js && node --check src/photo-lifecycle.js && node --check src/grounded-chat.js && node --check src/training-contribution.js && node --check scripts/record_release_demo.mjs && node --check tests/staging.acceptance.mjs && node --check tests/manual-fallback.acceptance.mjs && node --check tests/provisional-suggestion.acceptance.mjs && node --check tests/followup.acceptance.mjs && node --check tests/vision-refusal.acceptance.mjs && bash -n scripts/bootstrap_selfhost_smolvlm.sh && bash -n scripts/run_selfhost_smolvlm.sh && python3 -m py_compile scripts/ingest_training_photo.py scripts/build_release.py scripts/deploy_staging.py scripts/build_vision_corpus.py && node --check scripts/record_worker_benchmark.mjs && node --check tests/worker-readiness.acceptance.mjs && node --check tests/pattern-summary.acceptance.mjs && node --check tests/photo-lifecycle.acceptance.mjs && node --check tests/training-contribution.acceptance.mjs && node --check tests/portability.acceptance.mjs && node --check tests/grounded-chat.acceptance.mjs && bash -n scripts/worker_ready.sh && bash -n deploy/worker/entrypoint.sh && bash -n deploy/worker/build_image.sh && bash -n deploy/worker/run_worker_container.sh",
     "check:diff": "bash scripts/check_diff.sh",
     "start": "node server.mjs",
-    "test:worker-readiness": "node tests/worker-readiness.acceptance.mjs"
+    "test:worker-readiness": "node tests/worker-readiness.acceptance.mjs",
+    "test:portability": "node tests/portability.acceptance.mjs"
   },
   "devDependencies": {
     "playwright": "^1.62.1"

scripts/build_release.py

@@ -9,6 +9,7 @@ import os
 from pathlib import Path
 import re
 import shutil
+import socket
 import subprocess
 import sys
 import tarfile
@@ -51,6 +52,13 @@ DEMO_REQUIRED_CAPTIONS = (
     "The answer states the count and cites the four confirmed logs it counted",
     "Following a citation opens exactly the confirmed log behind that answer",
     "Ask something the journal cannot answer and Timmy refuses instead of reassuring",
+    "Training contribution is off by default: a saved log is never training data",
+    "The consent version and the receipt are on screen before the contribute button works",
+    "Withdrawing keeps a tombstone naming every derived artifact by contribution ID",
+    "A backup is versioned, and it carries the withdrawn receipt as a tombstone rather than silence",
+    "An older backup is upgraded on import, and the notice says which version the file came from",
+    "A file from a newer Timmy is refused with an instruction, and the ledger it would have replaced is untouched",
+    "A restored log still says it began as an AI suggestion you corrected — provenance is part of the record",
 )
 
 
@@ -69,6 +77,29 @@ def sha256(path: Path) -> str:
     return digest.hexdigest()
 
 
+def assert_port_free(host: str, port: int) -> None:
+    """Fail closed when something is already listening where the acceptance server must bind."""
+    with socket.socket() as sock:
+        sock.settimeout(1.0)
+        if sock.connect_ex((host, port)) == 0:
+            raise SystemExit(
+                f"Port {port} is already served by another process; refusing to gate or record this "
+                "release against a tree that is not the one under test."
+            )
+
+
+def assert_served_tree(tree: Path, host: str, port: int) -> None:
+    """Prove the responding server is the clone under test, not a stale checkout on the same port."""
+    for relative in ("src/domain.js", "app.js"):
+        served = urllib.request.urlopen(f"http://{host}:{port}/{relative}", timeout=5).read()
+        expected = (tree / relative).read_bytes()
+        if hashlib.sha256(served).hexdigest() != hashlib.sha256(expected).hexdigest():
+            raise SystemExit(
+                f"The acceptance server is serving {relative} from a different tree; "
+                "every gate and the demo would describe a release that is not this commit."
+            )
+
+
 def tracked_files(tree: Path) -> list[str]:
     names = run(["git", "ls-files"], tree, capture=True).splitlines()
     return sorted(name for name in names if name and not name.startswith(EXCLUDED_PREFIXES)
@@ -126,6 +157,10 @@ def main() -> int:
         run(["python3", "scripts/build_vision_corpus.py", "--verify"], tree)
         server_env = dict(os.environ)
         server_env.update({"HOST": "127.0.0.1", "PORT": "4173", "TIMMY_VISION_ENABLED": "false"})
+        # A leftover server from another checkout answers on this port and the readiness probe cannot
+        # tell it apart from ours, so every gate and the recorded demo would silently describe a
+        # different tree. Refuse to build over a live listener, and verify the served bytes afterwards.
+        assert_port_free("127.0.0.1", 4173)
         server_log = (release_dir / "acceptance-server.log").open("w", encoding="utf-8")
         server = subprocess.Popen(["node", "server.mjs"], cwd=tree, env=server_env,
                                   stdout=server_log, stderr=subprocess.STDOUT, text=True)
@@ -140,6 +175,9 @@ def main() -> int:
                     time.sleep(0.1)
             else:
                 raise SystemExit("Acceptance server did not become ready")
+            if server.poll() is not None:
+                raise SystemExit("Acceptance server exited after reporting ready")
+            assert_served_tree(tree, "127.0.0.1", 4173)
             run(["npm", "run", "test:ui"], tree)
             run(["npm", "run", "test:photo"], tree)
             run(["npm", "run", "test:mobile-capture"], tree)
@@ -152,6 +190,8 @@ def main() -> int:
             run(["npm", "run", "test:pattern-summary"], tree)
             run(["npm", "run", "test:grounded-chat"], tree)
             run(["npm", "run", "test:photo-lifecycle"], tree)
+            run(["npm", "run", "test:training-contribution"], tree)
+            run(["npm", "run", "test:portability"], tree)
             demo_raw = release_dir / f"timmy-talking-turd-{version}-demo.raw.webm"
             caption_receipt = release_dir / f"timmy-talking-turd-{version}-demo-captions.json"
             demo_env = dict(server_env)
@@ -199,7 +239,7 @@ def main() -> int:
         if not contact_sheet.exists() or contact_sheet.stat().st_size == 0:
             raise SystemExit("Release demo contact sheet was not produced")
         run(["npm", "audit", "--audit-level=high"], tree)
-        for file in ("app.js", "server.mjs", "service-worker.js", "src/analysis.js", "src/domain.js", "src/draft.js", "src/suggestion.js", "src/followup.js", "src/vision-readiness.js", "src/hermes-agent-service.js", "src/vision-config.js", "src/vision-service.js", "src/vision-corpus.js", "src/summary.js", "src/photo-lifecycle.js", "scripts/record_worker_benchmark.mjs", "tests/staging.acceptance.mjs", "tests/vision-refusal.acceptance.mjs", "tests/worker-readiness.acceptance.mjs", "tests/pattern-summary.acceptance.mjs", "tests/photo-lifecycle.acceptance.mjs"):
+        for file in ("app.js", "server.mjs", "service-worker.js", "src/analysis.js", "src/domain.js", "src/draft.js", "src/suggestion.js", "src/followup.js", "src/vision-readiness.js", "src/hermes-agent-service.js", "src/vision-config.js", "src/vision-service.js", "src/vision-corpus.js", "src/summary.js", "src/photo-lifecycle.js", "src/training-contribution.js", "scripts/record_worker_benchmark.mjs", "tests/staging.acceptance.mjs", "tests/vision-refusal.acceptance.mjs", "tests/worker-readiness.acceptance.mjs", "tests/pattern-summary.acceptance.mjs", "tests/photo-lifecycle.acceptance.mjs", "tests/training-contribution.acceptance.mjs"):
             run(["node", "--check", file], tree)
         run(["bash", "-n", "scripts/bootstrap_selfhost_smolvlm.sh"], tree)
         run(["bash", "-n", "scripts/run_selfhost_smolvlm.sh"], tree)
@@ -240,6 +280,7 @@ def main() -> int:
             "- Target-GPU benchmark: scripts/record_worker_benchmark.mjs records cold start, warm latency, and VRAM on the target GPU and refuses to write a receipt it did not measure; no GPU measurement is bundled with this release\n"
             "- Explainable pattern summaries (issue #34): the home insight card reports confirmed-log counts and form groupings per window, every line names the exact confirmed records behind it, following a citation opens those records, and a window below the minimum says it is too sparse instead of describing a trend; no line explains a cause, rules on food, or offers a health verdict\n"
             "- Private photo lifecycle (issue #36): the journal marks a log that holds a saved photo without rendering a thumbnail, showing the image is an explicit request, removing it keeps every confirmed field, deleting a log is a separate two-step decision that takes its photo, and delete-all removes the ledger and every stored photo together\n"
+            "- Training contribution is a separate opt-in (issue #24): a journal save records no contribution, the consent version and the receipt are on screen before the control can be pressed, the receipt is queued on this device only (this build transmits nothing) and carries no note text, symptom answers, or photo bytes, and a withdrawal keeps a tombstone naming every derived artifact by contribution id\n"
             "- Safety: suggestions are observable-field assistance, never diagnosis; user confirmation is required\n"
             "- Known limitation: open-weight VLM acceptance is proven, Bristol accuracy is not clinically validated\n"
             "- Package excludes model weights, medical-image corpora, raw research pages, generated screenshots, and video production assets\n"
@@ -285,7 +326,7 @@ def main() -> int:
             "codec": "h264",
             "pixel_format": "yuv420p",
             "recorded_from_working_app": True,
-            "fixture_data": "synthetic-Type-4, deterministic vision suggestion reviewed, confirmed, and corrected to Type 2, user-reported hard-stool follow-up with non-diagnostic self-care and a confirmed black/tarry red flag, the CC0 synthetic vision corpus replaying a non-stool refusal, an unreadable-fields abstention, an out-of-range fail-closed reply, and a blank-plus-out-of-range fail-closed reply, offline vision status, fictional multi-day sample logs driving the explainable pattern summary and its citation sheet, a sparse fictional window showing the insufficient-data copy, a grounded local chat answer citing each counted log and opening the cited record, a refusal that borrows no journal evidence, and a deterministic Hermes chat reply whose positional refs render as sources",
+            "fixture_data": "synthetic-Type-4, deterministic vision suggestion reviewed, confirmed, and corrected to Type 2, user-reported hard-stool follow-up with non-diagnostic self-care and a confirmed black/tarry red flag, the CC0 synthetic vision corpus replaying a non-stool refusal, an unreadable-fields abstention, an out-of-range fail-closed reply, and a blank-plus-out-of-range fail-closed reply, offline vision status, fictional multi-day sample logs driving the explainable pattern summary and its citation sheet, a sparse fictional window showing the insufficient-data copy, a grounded local chat answer citing each counted log and opening the cited record, a refusal that borrows no journal evidence, and a deterministic Hermes chat reply whose positional refs render as sources, plus the opt-in training contribution path where nothing is queued after ordinary saves, the consent version and receipt precede the confirm control, one receipt is queued on the device only, and withdrawal leaves a tombstone naming each derived artifact, plus a versioned backup that carries the logs and the withdrawn receipt, an older version 1 file upgraded with the version named on screen, a file from a newer Timmy refused without changing the ledger, and a restored log still showing it began as a corrected AI suggestion",
         },
         "gates": {
             "unit_security": "passed",
@@ -300,6 +341,8 @@ def main() -> int:
             "worker_post_load_readiness": "passed",
             "longitudinal_pattern_summary": "passed",
             "grounded_chat_citations": "passed",
+            "training_contribution_consent": "passed",
+            "portable_backup_restore": "passed",
             "dependency_audit_high": "passed",
             "syntax": "passed",
             "secret_scan": "passed",

scripts/record_release_demo.mjs

@@ -1,5 +1,5 @@
 import { chromium } from 'playwright';
-import { mkdir, writeFile } from 'node:fs/promises';
+import { mkdir, readFile, writeFile } from 'node:fs/promises';
 import path from 'node:path';
 import { fileURLToPath } from 'node:url';
 import { analyzePhoto, visionFailureResponse } from '../src/vision-service.js';
@@ -477,6 +477,144 @@ await page.getByText(/Your poop\. Your phone\./i).waitFor();
 await caption('Every byte-bearing control the model names, in the running app: local ledger, consent-gated upload, portable export, full deletion', 2800);
 await indicate('#export');
 await caption('Export writes a plain JSON file you hold — the model records it as a data-lifetime boundary, not a server sync', 2600);
+// Issue #24 — training contribution is a second, separate consent. The recording shows the section
+// reporting nothing queued after ordinary saves, the version and receipt on screen before the
+// button can be pressed, one receipt queued on the device only, and a withdrawal tombstone that
+// names each derived artifact by contribution id.
+await caption('Training contribution is off by default: a saved log is never training data', 2600);
+await page.locator('[data-training-consent]').waitFor();
+const contributionKey = await page.evaluate(() => `timmy:${document.querySelector('meta[name="timmy-base-path"]')?.content || '/'}:training-contributions-v1`);
+const storedContributions = async () => JSON.parse(await page.evaluate(key => localStorage.getItem(key) || '[]', contributionKey));
+if ((await page.locator('[data-contribution-queued-count]').innerText()).trim() !== '0') {
+  throw new Error('a journal save must not queue a training contribution');
+}
+await indicate('[data-contribute-entry="demo-wipe"]');
+await tap('[data-contribute-entry="demo-wipe"]', 600);
+await page.locator('[data-contribution-sheet]').waitFor();
+const receiptId = (await page.locator('[data-receipt-id]').innerText()).trim();
+if (!receiptId) throw new Error('the consent sheet must name the receipt before consent');
+const sheetCopy = await page.locator('[data-contribution-sheet]').innerText();
+if (!sheetCopy.includes('training-consent-v1')) throw new Error('the consent sheet must state the consent version');
+if (!(await page.locator('#contribute-confirm').isDisabled())) throw new Error('the contribute control must stay disabled until the terms are accepted');
+if ((await storedContributions()).length !== 0) throw new Error('no receipt may exist before explicit consent');
+await caption('The consent version and the receipt are on screen before the contribute button works', 3000);
+await page.locator('#training-consent-check').check();
+await tap('#contribute-confirm', 700);
+await page.locator('[data-contribution-state="queued-local"]').waitFor();
+const queuedReceipts = await storedContributions();
+if (queuedReceipts.length !== 1 || queuedReceipts[0].consentVersion !== 'training-consent-v1') {
+  throw new Error('one queued receipt must carry the consent version it was accepted under');
+}
+if (JSON.stringify(queuedReceipts).includes('data:image')) throw new Error('a receipt must never copy the photo bytes');
+await caption('One confirmed log is queued on this device with a receipt you can withdraw — nothing is uploaded', 3200);
+await indicate('[data-contribution-state="queued-local"]');
+await tap(`[data-withdraw="${receiptId}"]`, 700);
+await page.locator('[data-contribution-state="withdrawn"]').waitFor();
+const withdrawnReceipts = await storedContributions();
+const tombstone = withdrawnReceipts[0];
+if (!tombstone || tombstone.state !== 'withdrawn') throw new Error('withdrawal must keep the receipt as a tombstone');
+if ((tombstone.artifacts || []).length !== 2) throw new Error('the tombstone must name every derived artifact');
+for (const artifact of tombstone.artifacts) {
+  if (artifact.contributionId !== receiptId) throw new Error('every derived artifact must be addressed by contribution id');
+  if (artifact.state !== 'withdrawn') throw new Error('every derived artifact must be marked withdrawn');
+}
+await caption('Withdrawing keeps a tombstone naming every derived artifact by contribution ID', 3000);
+await indicate('[data-withdrawn-artifacts]');
+
+// Issue #35 — a backup is the person's own record, so it carries a version and everything it is
+// claimed to hold. The recording exports the real file, imports an older version and a newer one,
+// and reopens a restored log. Fictional sample logs are used throughout; nothing here is real data.
+const exportDownload = page.waitForEvent('download');
+await tap('#export', 600);
+const exportedBackup = JSON.parse(await readFile(await (await exportDownload).path(), 'utf8'));
+if (exportedBackup.schemaVersion !== 2) throw new Error('the exported backup must declare the current schema version');
+if (!Array.isArray(exportedBackup.entries) || !Array.isArray(exportedBackup.contributions)) {
+  throw new Error('a backup must carry both the confirmed logs and the contribution receipts');
+}
+const exportedReceipt = exportedBackup.contributions.find(receipt => receipt.contributionId === receiptId);
+if (!exportedReceipt || exportedReceipt.state !== 'withdrawn') {
+  throw new Error('the backup must carry the withdrawn receipt as a tombstone');
+}
+if (!(exportedReceipt.artifacts || []).length) throw new Error('the backup tombstone must still name its derived artifacts');
+await page.locator('[data-portability-notice][data-portability-version="2"]').waitFor();
+await caption('A backup is versioned, and it carries the withdrawn receipt as a tombstone rather than silence', 3200);
+
+const fictionalLegacyBackup = JSON.stringify({
+  product: 'Timmy the Talking Turd',
+  schemaVersion: 1,
+  exportedAt: '2026-08-01T09:00:00.000Z',
+  entries: [{
+    id: 'demo-legacy-backup',
+    occurredAt: new Date(Date.now() - 3 * 86400000).toISOString(),
+    bristolType: 3,
+    color: 'brown',
+    urgency: 1,
+    discomfort: 0,
+    note: 'fictional version 1 backup',
+    photoDataUrl: '',
+    symptoms: {},
+  }],
+});
+await page.locator('#import').setInputFiles({ name: 'timmy-backup-v1.json', mimeType: 'application/json', buffer: Buffer.from(fictionalLegacyBackup) });
+await page.locator('[data-portability-notice][data-portability-version="1"]').waitFor();
+const upgradeNotice = (await page.locator('[data-portability-notice]').innerText()).trim();
+if (!/upgraded/i.test(upgradeNotice)) throw new Error('an older backup must be reported as upgraded, not silently rewritten');
+await caption('An older backup is upgraded on import, and the notice says which version the file came from', 3400);
+
+const ledgerBeforeFuture = await storedLedger();
+await page.locator('#import').setInputFiles({
+  name: 'timmy-backup-v3.json', mimeType: 'application/json',
+  buffer: Buffer.from(JSON.stringify({ product: 'Timmy the Talking Turd', schemaVersion: 3, entries: [{ id: 'demo-future', bristolType: 7 }] })),
+});
+await page.locator('[data-portability-error]').waitFor();
+if (!/newer version of Timmy/i.test(await page.locator('[data-portability-error]').innerText())) {
+  throw new Error('a backup from a newer Timmy must be refused with an instruction to update');
+}
+if ((await storedLedger()).raw !== ledgerBeforeFuture.raw) {
+  throw new Error('a refused import must not change the ledger it would have replaced');
+}
+await caption('A file from a newer Timmy is refused with an instruction, and the ledger it would have replaced is untouched', 3400);
+
+const fictionalAssistedBackup = JSON.stringify({
+  product: 'Timmy the Talking Turd',
+  schemaVersion: 2,
+  exportedAt: new Date().toISOString(),
+  entries: [{
+    id: 'demo-restored-provenance',
+    occurredAt: new Date(Date.now() - 86400000).toISOString(),
+    bristolType: 2,
+    color: 'brown',
+    urgency: 1,
+    discomfort: 0,
+    note: 'fictional restored log',
+    photoDataUrl: '',
+    symptoms: {},
+    provenance: {
+      source: 'ai-corrected',
+      model: 'SmolVLM2-2.2B-Instruct',
+      suggestedBristolType: 4,
+      suggestedColor: 'brown',
+      confirmedAt: new Date(Date.now() - 86400000).toISOString(),
+    },
+  }],
+  contributions: [],
+});
+await page.locator('#import').setInputFiles({ name: 'timmy-backup-v2.json', mimeType: 'application/json', buffer: Buffer.from(fictionalAssistedBackup) });
+await page.locator('[data-portability-notice][data-portability-version="2"]').waitFor();
+await tap('[data-view="calendar"]', 550);
+await page.locator('[data-entry-open="demo-restored-provenance"]').waitFor();
+await tap('[data-entry-open="demo-restored-provenance"]', 550);
+await page.locator('[data-entry-provenance="ai-corrected"]').waitFor();
+const provenanceLine = (await page.locator('[data-entry-provenance="ai-corrected"]').innerText()).trim();
+if (!/corrected/i.test(provenanceLine) || !/SmolVLM2/.test(provenanceLine)) {
+  throw new Error('a restored log must still show that it began as a corrected AI suggestion');
+}
+await caption('A restored log still says it began as an AI suggestion you corrected — provenance is part of the record', 3400);
+await indicate('[data-entry-provenance="ai-corrected"]');
+await tap('#entry-sheet-close', 450);
+await tap('[data-view="privacy"]', 550);
+await page.locator('#delete-all').waitFor();
+
 await indicate('#delete-all');
 await tap('#delete-all', 650);
 await page.getByText(/Local ledger and photos deleted/).waitFor();
@@ -485,6 +623,9 @@ if (wiped.raw !== null) throw new Error('delete-all must remove the stored ledge
 if (await page.evaluate(() => JSON.stringify(localStorage).includes('data:image'))) {
   throw new Error('no photo bytes may survive delete-all');
 }
+if (await page.evaluate(key => localStorage.getItem(key), contributionKey) !== null) {
+  throw new Error('delete-all must clear the contribution receipts as well');
+}
 await caption('Delete all local data clears the ledger and every saved photo in this browser; nothing is kept on a server', 2900);
 await tap('[data-view="home"]', 500);
 // Issue #37 — a chat answer about the journal must point at the confirmed records behind it. The

service-worker.js

@@ -1,7 +1,7 @@
 const ROOT = new URL(self.registration.scope).pathname;
 const appPath = path => `${ROOT}${String(path).replace(/^\/+/, '')}`;
 const CACHE_NAMESPACE = `timmy-shell:${ROOT}:`;
-const CACHE = `${CACHE_NAMESPACE}v5`;
+const CACHE = `${CACHE_NAMESPACE}v6`;
 const ASSETS = [
   '',
   'index.html',

src/domain.js

@@ -111,9 +111,32 @@ export function sanitizeEntry(input = {}) {
     note: String(input.note || '').trim().slice(0, 500),
     photoDataUrl: typeof input.photoDataUrl === 'string' && input.photoDataUrl.startsWith('data:image/') ? input.photoDataUrl : '',
     symptoms,
+    provenance: sanitizeProvenance(input.provenance),
   };
 }
 
+// Provenance is the only record of whether a confirmed log began as an AI suggestion. It is kept to
+// an allowlist so a backup can never smuggle a credential, a prompt, or a raw model reply out of the
+// device, and it is `null` for logs that never had one — a missing record is not a manual entry.
+const PROVENANCE_SOURCES = Object.freeze(['ai-confirmed', 'ai-corrected']);
+
+function sanitizeProvenance(value) {
+  if (!value || typeof value !== 'object') return null;
+  if (!PROVENANCE_SOURCES.includes(value.source)) return null;
+  const provenance = { source: value.source };
+  if (typeof value.model === 'string' && value.model.trim()) provenance.model = value.model.trim().slice(0, 80);
+  const suggestedType = Number(value.suggestedBristolType);
+  if (Number.isInteger(suggestedType) && suggestedType >= 1 && suggestedType <= 7) {
+    provenance.suggestedBristolType = suggestedType;
+  }
+  if (['brown', 'green', 'yellow', 'pale', 'red', 'black'].includes(value.suggestedColor)) {
+    provenance.suggestedColor = value.suggestedColor;
+  }
+  const confirmedAt = value.confirmedAt ? new Date(value.confirmedAt) : null;
+  if (confirmedAt && !Number.isNaN(confirmedAt.valueOf())) provenance.confirmedAt = confirmedAt.toISOString();
+  return provenance;
+}
+
 export function photoQualityMessage({ width = 0, height = 0, brightness = 0.5 } = {}) {
   if (width < 640 || height < 480) return 'Move a little closer or use a higher-resolution photo. The image stays on this device.';
   if (brightness < 0.12) return 'Add more light before saving. Timmy only checks whether the photo is usable.';
@@ -121,19 +144,120 @@ export function photoQualityMessage({ width = 0, height = 0, brightness = 0.5 }
   return 'Ready for your review. Choose the matching Bristol form yourself; Timmy does not interpret the picture.';
 }
 
+export const LEDGER_EXPORT_VERSION = 2;
+
 export function exportLedger(entries, exportedAt = new Date().toISOString()) {
+  return exportLedgerBackup({ entries, exportedAt });
+}
+
+// A backup is written through an allowlist, so only fields this build understands leave the device.
+// Entries are re-sanitized on the way out as well as in: an unknown key on an entry is not part of
+// the person's record, and a crafted key must never be laundered through a backup.
+export function exportLedgerBackup({ entries = [], contributions = [], exportedAt = new Date().toISOString() } = {}) {
+  const list = Array.isArray(entries) ? entries.map(sanitizeEntry) : [];
+  const receipts = (Array.isArray(contributions) ? contributions : []).map(sanitizeContribution).filter(Boolean);
   return JSON.stringify({
     product: 'Timmy the Talking Turd',
-    schemaVersion: 1,
+    schemaVersion: LEDGER_EXPORT_VERSION,
     exportedAt,
-    entries: Array.isArray(entries) ? entries : [],
+    entries: list,
+    contributions: receipts,
   }, null, 2);
 }
 
+const CONTRIBUTION_STATES = Object.freeze(['queued-local', 'withdrawn']);
+const CONTRIBUTION_ARTIFACTS = Object.freeze(['raw-image', 'confirmed-label']);
+
+function isoOrNull(value) {
+  if (!value) return null;
+  const parsed = new Date(value);
+  return Number.isNaN(parsed.valueOf()) ? null : parsed.toISOString();
+}
+
+export function sanitizeContribution(input = {}) {
+  const contributionId = String(input?.contributionId || '').trim().slice(0, 120);
+  if (!contributionId) return null;
+  const state = CONTRIBUTION_STATES.includes(input.state) ? input.state : 'queued-local';
+  const receipt = {
+    contributionId,
+    entryId: String(input.entryId || '').trim().slice(0, 120),
+    consentVersion: String(input.consentVersion || '').trim().slice(0, 60),
+    consentedAt: isoOrNull(input.consentedAt),
+    labels: {
+      bristolType: Math.min(7, Math.max(1, Number(input.labels?.bristolType) || 4)),
+      color: ['brown', 'green', 'yellow', 'pale', 'red', 'black'].includes(input.labels?.color) ? input.labels.color : 'brown',
+    },
+    state,
+  };
+  const withdrawnAt = isoOrNull(input.withdrawnAt);
+  if (state === 'withdrawn' && withdrawnAt) receipt.withdrawnAt = withdrawnAt;
+  if (state === 'withdrawn') {
+    receipt.artifacts = (Array.isArray(input.artifacts) ? input.artifacts : [])
+      .filter(artifact => CONTRIBUTION_ARTIFACTS.includes(artifact?.artifact))
+      .map(artifact => ({
+        artifact: artifact.artifact,
+        contributionId: String(artifact.contributionId || contributionId).slice(0, 120),
+        state: artifact.state === 'withdrawn' ? 'withdrawn' : 'active',
+      }));
+  }
+  return receipt;
+}
+
 export function importLedger(text) {
-  const parsed = JSON.parse(text);
-  if (parsed?.schemaVersion !== 1 || !Array.isArray(parsed.entries)) throw new Error('This is not a supported Timmy export.');
-  return parsed.entries.map(sanitizeEntry);
+  return importLedgerBackup(text).entries;
+}
+
+// A backup can be older than this build. Version 1 files record no provenance for their entries, so
+// the migration leaves that field empty instead of guessing a source, and the caller is told which
+// version the file came from.
+export const LEDGER_IMPORT_LIMITS = Object.freeze({ maxTextLength: 16 * 1024 * 1024, maxEntries: 5000 });
+
+export function importLedgerBackup(text) {
+  const raw = String(text ?? '');
+  if (raw.length > LEDGER_IMPORT_LIMITS.maxTextLength) {
+    throw new Error('That backup is too large for Timmy to read safely. Nothing was imported.');
+  }
+  let parsed;
+  try {
+    parsed = JSON.parse(raw);
+  } catch {
+    throw new Error('That file is not readable JSON, so nothing was imported.');
+  }
+  if (!parsed || typeof parsed !== 'object' || !Array.isArray(parsed.entries)) {
+    throw new Error('This is not a supported Timmy backup.');
+  }
+  const fromVersion = Number(parsed.schemaVersion);
+  if (Number.isInteger(fromVersion) && fromVersion > LEDGER_EXPORT_VERSION) {
+    throw new Error(`This backup was written by a newer version of Timmy (version ${fromVersion}). Update Timmy before importing it; nothing was imported.`);
+  }
+  if (!Number.isInteger(fromVersion) || fromVersion < 1) {
+    throw new Error('This is not a supported Timmy backup.');
+  }
+  if (parsed.entries.length > LEDGER_IMPORT_LIMITS.maxEntries) {
+    throw new Error('That backup holds more logs than Timmy will import at once. Nothing was imported.');
+  }
+  const entries = parsed.entries.map(sanitizeEntry);
+  const rawContributions = Array.isArray(parsed.contributions) ? parsed.contributions : [];
+  const contributions = rawContributions.map(sanitizeContribution).filter(Boolean);
+  const migrated = fromVersion < LEDGER_EXPORT_VERSION;
+  // The caller already says what it restored, so this notice only reports the upgrade. Restating the
+  // restored count here made the on-screen notice read as two stacked sentences saying one thing.
+  const notices = migrated
+    ? [`Upgraded from version ${fromVersion} to version ${LEDGER_EXPORT_VERSION}; fields the old file did not record are left empty.`]
+    : [];
+  // Skipping an unreadable receipt silently would tell someone their opt-in vanished. Say it.
+  const skipped = rawContributions.length - contributions.length;
+  if (skipped > 0) {
+    notices.push(`${skipped} training contribution ${skipped === 1 ? 'receipt' : 'receipts'} could not be read and ${skipped === 1 ? 'was' : 'were'} skipped.`);
+  }
+  return {
+    entries,
+    contributions,
+    fromVersion,
+    migrated,
+    notices,
+    exportedAt: typeof parsed.exportedAt === 'string' ? parsed.exportedAt : null,
+  };
 }
 
 export const urgentSymptomKeys = Object.freeze([...URGENT_KEYS]);

src/training-contribution.js

@@ -0,0 +1,103 @@
+// Issue #24 — contributing a confirmed photo to Timmy's training corpus is a separate decision from
+// saving a log. A journal save records nothing here; a contribution exists only after someone reads
+// the consent terms and accepts them, and it exists as a receipt they can point a withdrawal at.
+// Nothing is transmitted: this build queues the receipt on the device so the corpus pipeline (#25)
+// has something auditable to consume later.
+export const TRAINING_CONSENT_VERSION = 'training-consent-v1';
+
+const IMAGE_DATA_URL = /^data:image\/[a-z0-9.+-]+(?:;base64)?,[A-Za-z0-9+/=%.-]+$/i;
+const CONTRIBUTED_ARTIFACTS = ['raw-image', 'confirmed-label'];
+
+export function consentTerms() {
+  return {
+    version: TRAINING_CONSENT_VERSION,
+    includes: [
+      'The saved photo bytes for this one log',
+      'The confirmed Bristol form, broad color, and image quality',
+    ],
+    excludes: [
+      'Your note text',
+      'Your symptom answers',
+      'Urgency and discomfort ratings',
+      'Anything identifying you or this device',
+    ],
+    transport: 'Queued on this device only — nothing is uploaded in this build.',
+  };
+}
+
+export function defaultContributionState() {
+  return { optedIn: false, receipt: null };
+}
+
+export function contributionEligibility(entry) {
+  if (!entry || !entry.id) return { eligible: false, reason: 'This log has no identifier to attach a receipt to.' };
+  if (!IMAGE_DATA_URL.test(String(entry.photoDataUrl || ''))) {
+    return { eligible: false, reason: 'This log has no saved photo to contribute.' };
+  }
+  if (!Number.isInteger(entry.bristolType) || entry.bristolType < 1 || entry.bristolType > 7) {
+    return { eligible: false, reason: 'This log has no confirmed Bristol form to contribute.' };
+  }
+  if (!entry.color) return { eligible: false, reason: 'This log has no confirmed color to contribute.' };
+  return { eligible: true, reason: '' };
+}
+
+export function receiptPreview(entry, { contributionId, consentedAt } = {}) {
+  if (!contributionId) throw new Error('A contribution receipt needs its own identifier.');
+  if (!consentedAt) throw new Error('A contribution receipt needs the moment of consent.');
+  const eligibility = contributionEligibility(entry);
+  if (!eligibility.eligible) throw new Error(eligibility.reason);
+  return {
+    contributionId,
+    entryId: entry.id,
+    consentVersion: TRAINING_CONSENT_VERSION,
+    consentedAt,
+    labels: { bristolType: entry.bristolType, color: entry.color },
+    state: 'queued-local',
+  };
+}
+
+export function contributionForEntry(contributions, entryId) {
+  if (!Array.isArray(contributions)) return null;
+  return contributions.find(item => item.entryId === entryId && item.state !== 'withdrawn') || null;
+}
+
+export function addContribution(contributions, receipt) {
+  const list = Array.isArray(contributions) ? contributions : [];
+  if (!receipt || receipt.consentVersion !== TRAINING_CONSENT_VERSION) {
+    throw new Error('A contribution needs the current consent version.');
+  }
+  if (contributionForEntry(list, receipt.entryId)) return list;
+  return [...list, receipt];
+}
+
+export function derivedArtifacts(receipt) {
+  const state = receipt?.state === 'withdrawn' ? 'withdrawn' : 'active';
+  return CONTRIBUTED_ARTIFACTS.map(artifact => ({
+    artifact,
+    contributionId: receipt?.contributionId || '',
+    state,
+  }));
+}
+
+export function withdrawContribution(contributions, contributionId, withdrawnAt) {
+  const list = Array.isArray(contributions) ? contributions : [];
+  const receipt = list.find(item => item.contributionId === contributionId);
+  if (!receipt) return { contributions: list, tombstone: null };
+  const withdrawn = {
+    ...receipt,
+    state: 'withdrawn',
+    withdrawnAt,
+    artifacts: derivedArtifacts({ ...receipt, state: 'withdrawn' }),
+  };
+  return {
+    contributions: list.map(item => (item.contributionId === contributionId ? withdrawn : item)),
+    tombstone: {
+      contributionId: receipt.contributionId,
+      entryId: receipt.entryId,
+      consentVersion: receipt.consentVersion,
+      consentedAt: receipt.consentedAt,
+      withdrawnAt,
+      artifacts: withdrawn.artifacts,
+    },
+  };
+}

styles.css

@@ -59,3 +59,19 @@ main{display:block}.eyebrow{font-size:11px;font-weight:800;letter-spacing:.1em;t
 .chat-citation{min-height:32px;padding:5px 10px;border:1px solid #bcdfd4;border-radius:999px;background:var(--surface);color:var(--teal);font-weight:800;font-size:11px;cursor:pointer}
 .chat-citation:active{background:#e9f5f0}
 .chat-unverified{margin:9px 0 0;padding-top:8px;border-top:1px solid rgba(55,40,31,.09);font-size:11px;line-height:1.4;font-weight:700;color:#8a5a12}
+
+/* Issue #24 — an opt-in receipt and its tombstone must read as separate facts, not one run-on line. */
+.contribution-list{display:flex;flex-direction:column;margin-top:10px}
+.training-consent h3{font-size:13px;margin:16px 0 2px}
+.contribution-row{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:11px 0;border-top:1px solid var(--line)}
+.contribution-row:first-child{border-top:0}
+.contribution-row>div{display:flex;flex-direction:column;gap:3px;min-width:0}
+.contribution-row strong{font-size:13px;line-height:1.3}
+.contribution-row span{font-size:11px;line-height:1.4;color:var(--muted);overflow-wrap:anywhere}
+.contribution-row .btn{min-height:40px;padding:0 14px;font-size:12px;flex:0 0 auto}
+.contribution-row.withdrawn strong{color:var(--muted)}
+
+/* Issue #35 — a backup says which version it came from, and a refused file says so in place. */
+.portability-notice{margin:0 0 12px;padding:12px 14px;border-radius:15px;font-size:12.5px;line-height:1.45;font-weight:700;background:var(--teal-soft);color:#155c4f;border:1px solid #bcdfd4}
+.portability-notice.error{background:var(--red-soft);border-color:#eec1ba;color:#75261f}
+.entry-provenance{margin:10px 0 0;padding-top:9px;border-top:1px solid rgba(55,40,31,.09)}

tests/domain.test.js

@@ -8,6 +8,7 @@ import {
   detectUrgentText,
   exportLedger,
   hasUrgentLedgerContext,
+  LEDGER_EXPORT_VERSION,
   photoQualityMessage,
   sanitizeEntry,
 } from '../src/domain.js';
@@ -113,9 +114,10 @@ test('sanitizes a user entry to the MVP data contract', () => {
   });
   assert.deepEqual(Object.keys(entry).sort(), [
     'bristolType', 'color', 'discomfort', 'id', 'note', 'occurredAt',
-    'photoDataUrl', 'symptoms', 'urgency'
+    'photoDataUrl', 'provenance', 'symptoms', 'urgency'
   ].sort());
   assert.equal(entry.unexpected, undefined);
+  assert.equal(entry.provenance, null, 'a manual entry records no AI provenance rather than an invented one');
 });
 
 test('photo quality guidance is deterministic and does not claim visual diagnosis', () => {
@@ -125,10 +127,11 @@ test('photo quality guidance is deterministic and does not claim visual diagnosi
   assert.doesNotMatch(photoQualityMessage({ width: 1200, height: 900, brightness: 0.5 }), /type [1-7]|disease|diagnos/i);
 });
 
-test('export ledger is portable JSON with version and entries', () => {
+test('export ledger is portable JSON with the current version and entries', () => {
   const text = exportLedger([{ id: 'a', bristolType: 4 }], '2026-08-18T00:00:00.000Z');
   const parsed = JSON.parse(text);
-  assert.equal(parsed.schemaVersion, 1);
+  assert.equal(parsed.schemaVersion, LEDGER_EXPORT_VERSION);
+  assert.equal(parsed.schemaVersion, 2);
   assert.equal(parsed.exportedAt, '2026-08-18T00:00:00.000Z');
   assert.equal(parsed.entries.length, 1);
 });

tests/portability.acceptance.mjs

@@ -0,0 +1,131 @@
+import { chromium } from 'playwright';
+import assert from 'node:assert/strict';
+import { readFile } from 'node:fs/promises';
+
+// Issue #35 — a backup is the person's own record, and it has to keep working as the app's AI
+// provenance fields evolve. This drives the real app in a browser: a version 1 file is upgraded and
+// says so, a file from a newer Timmy is refused without touching the ledger, the export carries the
+// contribution receipts, and a log saved from a confirmed AI suggestion comes back saying that.
+//
+// The image used below is the committed synthetic Type 4 fixture; no real photo is involved.
+const browser = await chromium.launch({ headless: true });
+const context = await browser.newContext({ viewport: { width: 390, height: 844 }, deviceScaleFactor: 2, serviceWorkers: 'block' });
+const page = await context.newPage();
+const errors = [];
+page.on('console', message => { if (message.type() === 'error') errors.push(message.text()); });
+page.on('pageerror', error => errors.push(error.message));
+page.on('dialog', dialog => dialog.accept());
+
+const suggestionBody = {
+  status: 'suggestion', isStool: true, bristolType: 4, color: 'brown', confidence: 0.83,
+  imageQuality: 'good', observations: 'Smooth, formed appearance.',
+  warning: 'Visual suggestion only. Confirm it yourself; this is not a diagnosis.',
+};
+await page.route('**/api/vision-status', route => route.fulfill({
+  status: 200, contentType: 'application/json',
+  body: JSON.stringify({ enabled: true, profile: 'selfhost', processor: 'self-hosted', model: 'SmolVLM2-2.2B-Instruct', providerReady: true, modelSeen: true }),
+}));
+await page.route('**/api/analyze', route => route.fulfill({ status: 200, contentType: 'application/json', body: JSON.stringify(suggestionBody) }));
+await page.route('**/api/agent/status', route => route.fulfill({
+  status: 200, contentType: 'application/json',
+  body: JSON.stringify({ enabled: true, configured: false, authenticated: false, mode: 'local-fallback' }),
+}));
+
+await page.goto('http://127.0.0.1:4173', { waitUntil: 'networkidle' });
+await page.evaluate(() => localStorage.clear());
+await page.reload({ waitUntil: 'networkidle' });
+
+const basePath = () => page.evaluate(() => document.querySelector('meta[name="timmy-base-path"]')?.content || '/');
+const storeKey = async suffix => `timmy:${await basePath()}:${suffix}`;
+const readStore = async suffix => {
+  const raw = await page.evaluate(key => localStorage.getItem(key), await storeKey(suffix));
+  return raw === null ? null : JSON.parse(raw);
+};
+// The privacy view sits behind the journal's settings row, exactly as a person reaches it.
+const openPrivacy = async () => {
+  await page.locator('[data-view="calendar"]').first().click();
+  await page.locator('.settings-row[data-view="privacy"]').first().click();
+  await page.locator('#export').waitFor();
+};
+const importBackup = async (name, text) => {
+  await page.locator('#import').setInputFiles({ name, mimeType: 'application/json', buffer: Buffer.from(text) });
+  await page.waitForTimeout(350);
+};
+
+const legacyBackup = JSON.stringify({
+  product: 'Timmy the Talking Turd',
+  schemaVersion: 1,
+  exportedAt: '2026-08-01T09:00:00.000Z',
+  entries: [
+    { id: 'legacy-1', occurredAt: '2026-08-01T08:00:00.000Z', bristolType: 3, color: 'brown', urgency: 1, discomfort: 0, note: 'synthetic', photoDataUrl: '', symptoms: {} },
+    { id: 'legacy-2', occurredAt: '2026-08-02T08:00:00.000Z', bristolType: 6, color: 'brown', urgency: 2, discomfort: 1, note: '', photoDataUrl: '', symptoms: {} },
+  ],
+});
+
+// 1. A version 1 backup is imported, upgraded, and says which version it came from.
+await openPrivacy();
+await importBackup('timmy-backup-v1.json', legacyBackup);
+const upgraded = await readStore('ledger-v1');
+assert.equal(upgraded.length, 2, 'the version 1 backup must restore both logs');
+await page.locator('[data-portability-notice]').waitFor();
+const noticeText = (await page.locator('[data-portability-notice]').innerText()).trim();
+assert.match(noticeText, /version 1/i, 'the notice must name the version the file came from');
+assert.match(noticeText, /upgraded/i, 'the notice must say the backup was upgraded');
+assert.equal(await page.locator('[data-portability-notice]').getAttribute('data-portability-version'), '1');
+assert.equal(upgraded[0].provenance, null, 'a pre-provenance backup must not acquire a source it never recorded');
+assert.equal(upgraded[0].bristolType, 3, 'the confirmed form must survive the upgrade');
+
+// 2. A file from a newer Timmy is refused, and the ledger it would have replaced stays exactly as it was.
+const before = JSON.stringify(await readStore('ledger-v1'));
+await importBackup('timmy-backup-v3.json', JSON.stringify({ product: 'Timmy the Talking Turd', schemaVersion: 3, entries: [{ id: 'future', bristolType: 7 }] }));
+await page.locator('[data-portability-error]').waitFor();
+const errorText = (await page.locator('[data-portability-error]').innerText()).trim();
+assert.match(errorText, /newer version of Timmy/i);
+assert.equal(JSON.stringify(await readStore('ledger-v1')), before, 'a refused import must not change the ledger');
+
+// 3. A log saved from a confirmed AI suggestion records that provenance, and the export states it.
+await page.locator('[data-view="home"]').first().click();
+await page.locator('[data-scan]').first().click();
+await page.getByText(/Self-hosted model ready/i).waitFor();
+await page.locator('#gallery-photo').setInputFiles('tests/fixtures/synthetic-type4.jpg');
+await page.locator('#ai-consent').check();
+await page.locator('#analyze-photo').click();
+await page.locator('#use-suggestion').waitFor();
+await page.locator('#use-suggestion').click();
+await page.locator('[data-provenance="confirmed"]').waitFor();
+await page.locator('#next').click();
+await page.locator('#next').click();
+await page.locator('#save').click();
+await page.getByText(/Private log saved|Saved/).waitFor();
+const savedLedger = await readStore('ledger-v1');
+const assisted = savedLedger.find(entry => entry.id !== 'legacy-1' && entry.id !== 'legacy-2');
+assert.ok(assisted, 'the saved log must be in the ledger');
+assert.equal(assisted.provenance?.source, 'ai-confirmed', 'a confirmed AI suggestion must be recorded on the saved log');
+assert.equal(assisted.provenance?.suggestedBristolType, 4);
+assert.equal(assisted.provenance?.model, 'SmolVLM2-2.2B-Instruct');
+
+// 4. Export carries the current version, the entries, and the contribution receipts — and nothing else.
+await openPrivacy();
+const [download] = await Promise.all([page.waitForEvent('download'), page.locator('#export').click()]);
+const exported = JSON.parse(await readFile(await download.path(), 'utf8'));
+assert.equal(exported.schemaVersion, 2);
+assert.equal(exported.entries.length, 3);
+assert.deepEqual(exported.contributions, [], 'nothing was contributed, so no receipt may appear');
+assert.equal(exported.entries.find(entry => entry.id === assisted.id).provenance.source, 'ai-confirmed');
+
+// 5. Round trip: the export restores into a cleared browser with provenance intact.
+const exportedText = JSON.stringify(exported);
+await page.evaluate(() => localStorage.clear());
+await page.reload({ waitUntil: 'networkidle' });
+await openPrivacy();
+await importBackup('timmy-backup-v2.json', exportedText);
+const roundTripped = await readStore('ledger-v1');
+assert.equal(roundTripped.length, 3);
+const restoredAssisted = roundTripped.find(entry => entry.id === assisted.id);
+assert.deepEqual(restoredAssisted.provenance, assisted.provenance, 'provenance must survive a round trip');
+await page.locator('[data-portability-notice]').waitFor();
+assert.match((await page.locator('[data-portability-notice]').innerText()).trim(), /version 2/i);
+
+assert.deepEqual(errors, [], `browser errors: ${errors.join(' | ')}`);
+await browser.close();
+console.log(JSON.stringify({ ok: true, scenes: ['v1-upgrade', 'future-refused', 'provenance-recorded', 'export-v2', 'round-trip'] }));

tests/portability.test.js

@@ -0,0 +1,152 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+
+import { LEDGER_EXPORT_VERSION, LEDGER_IMPORT_LIMITS, exportLedger, exportLedgerBackup, importLedger, importLedgerBackup } from '../src/domain.js';
+
+// Issue #35 — a backup is the person's own record. Provenance is part of what they own: a log that
+// was saved from a confirmed or corrected AI suggestion has to come back out of the export saying
+// exactly that, instead of silently reverting to looking like a manual entry.
+const confirmedByUser = {
+  id: 'demo-corrected',
+  occurredAt: '2026-08-18T10:00:00.000Z',
+  bristolType: 2,
+  color: 'brown',
+  urgency: 1,
+  discomfort: 0,
+  note: 'synthetic',
+  photoDataUrl: '',
+  symptoms: {},
+  provenance: {
+    source: 'ai-corrected',
+    model: 'SmolVLM2-2.2B-Instruct',
+    suggestedBristolType: 4,
+    suggestedColor: 'brown',
+    confirmedAt: '2026-08-18T09:59:00.000Z',
+  },
+};
+
+test('an export stamps the current schema version and keeps confirmed AI provenance', () => {
+  const parsed = JSON.parse(exportLedger([confirmedByUser], '2026-08-18T11:00:00.000Z'));
+
+  assert.equal(LEDGER_EXPORT_VERSION, 2);
+  assert.equal(parsed.schemaVersion, 2);
+  assert.equal(parsed.entries.length, 1);
+  assert.deepEqual(parsed.entries[0].provenance, confirmedByUser.provenance);
+  assert.equal(parsed.entries[0].bristolType, 2, 'the corrected value stays the saved value');
+});
+
+// A version 1 file was written before entries recorded provenance. Importing it must restore the
+// confirmed values and say plainly that this backup predates provenance, rather than inventing a
+// source for logs that never had one.
+const legacyBackup = JSON.stringify({
+  product: 'Timmy the Talking Turd',
+  schemaVersion: 1,
+  exportedAt: '2026-08-01T09:00:00.000Z',
+  entries: [
+    {
+      id: 'legacy-entry',
+      occurredAt: '2026-08-01T08:00:00.000Z',
+      bristolType: 4,
+      color: 'brown',
+      urgency: 2,
+      discomfort: 1,
+      note: '',
+      photoDataUrl: '',
+      symptoms: { blood: false },
+    },
+  ],
+});
+
+test('a version 1 backup imports its confirmed values and reports the upgrade', () => {
+  const result = importLedgerBackup(legacyBackup);
+
+  assert.equal(result.fromVersion, 1);
+  assert.equal(result.migrated, true);
+  assert.equal(result.entries.length, 1);
+  assert.equal(result.entries[0].id, 'legacy-entry');
+  assert.equal(result.entries[0].bristolType, 4);
+  assert.equal(result.entries[0].provenance, null, 'a pre-provenance backup must not be given a source it never recorded');
+  assert.match(result.notices.join(' '), /version 1/i);
+  assert.match(result.notices.join(' '), /upgraded/i);
+  // The import screen already reports what was restored; a notice that restates the count renders as
+  // a duplicated sentence on screen, so the upgrade notice must only describe the upgrade.
+  assert.doesNotMatch(result.notices.join(' '), /Restored \d+ logs?/);
+  assert.equal(importLedger(legacyBackup).length, 1, 'the plain entry import still works');
+});
+
+// A training contribution receipt is user-owned data too. A backup that restored the journal but
+// dropped the receipts would tell someone their opt-in never happened, so version 2 carries them —
+// with the withdrawal tombstone intact and nothing else copied out of the device.
+const withdrawnReceipt = {
+  contributionId: 'contrib-1',
+  entryId: 'demo-corrected',
+  consentVersion: 'training-consent-v1',
+  consentedAt: '2026-08-18T10:05:00.000Z',
+  labels: { bristolType: 2, color: 'brown' },
+  state: 'withdrawn',
+  withdrawnAt: '2026-08-18T10:30:00.000Z',
+  artifacts: [
+    { artifact: 'raw-image', contributionId: 'contrib-1', state: 'withdrawn' },
+    { artifact: 'confirmed-label', contributionId: 'contrib-1', state: 'withdrawn' },
+  ],
+  // A crafted file must not be able to hand a credential back to the app.
+  agentAccessCode: 'leak-me-please',
+};
+
+test('a backup carries contribution receipts and their tombstones without copying secrets', () => {
+  const text = exportLedgerBackup({
+    entries: [{ ...confirmedByUser, agentAccessCode: 'leak-me-please' }],
+    contributions: [withdrawnReceipt],
+    exportedAt: '2026-08-18T12:00:00.000Z',
+  });
+  const parsed = JSON.parse(text);
+
+  assert.equal(parsed.schemaVersion, 2);
+  assert.equal(parsed.contributions.length, 1);
+  assert.equal(parsed.contributions[0].state, 'withdrawn');
+  assert.deepEqual(parsed.contributions[0].artifacts, withdrawnReceipt.artifacts);
+  assert.equal(parsed.entries[0].agentAccessCode, undefined);
+  assert.doesNotMatch(text, /leak-me-please/);
+
+  const restored = importLedgerBackup(text);
+  assert.equal(restored.migrated, false);
+  assert.equal(restored.fromVersion, 2);
+  assert.equal(restored.contributions.length, 1);
+  assert.equal(restored.contributions[0].contributionId, 'contrib-1');
+  assert.equal(restored.contributions[0].state, 'withdrawn');
+  assert.deepEqual(restored.contributions[0].artifacts, withdrawnReceipt.artifacts);
+  assert.equal(restored.contributions[0].agentAccessCode, undefined);
+  assert.deepEqual(restored.entries[0].provenance, confirmedByUser.provenance);
+});
+
+test('a backup from a newer Timmy is refused with an instruction instead of a guess', () => {
+  const future = JSON.stringify({ product: 'Timmy the Talking Turd', schemaVersion: 3, entries: [], contributions: [] });
+
+  assert.throws(() => importLedgerBackup(future), /newer version of Timmy/i);
+});
+
+test('a file that is not a readable Timmy backup is refused', () => {
+  assert.throws(() => importLedgerBackup('{not json'), /not readable JSON/i);
+  assert.throws(() => importLedgerBackup(JSON.stringify({ hello: 'world' })), /not a supported Timmy backup/i);
+  assert.throws(() => importLedgerBackup(JSON.stringify({ schemaVersion: 0, entries: [] })), /not a supported Timmy backup/i);
+});
+
+test('an oversized backup or one with too many logs is refused before anything is imported', () => {
+  const huge = `{"schemaVersion":2,"entries":[]}${' '.repeat(LEDGER_IMPORT_LIMITS.maxTextLength)}`;
+  assert.throws(() => importLedgerBackup(huge), /too large/i);
+
+  const many = { schemaVersion: 2, entries: Array.from({ length: LEDGER_IMPORT_LIMITS.maxEntries + 1 }, () => ({ id: 'x', bristolType: 4 })) };
+  assert.throws(() => importLedgerBackup(JSON.stringify(many)), /more logs than Timmy will import/i);
+});
+
+test('an unreadable contribution receipt is skipped and reported, never silently dropped', () => {
+  const text = JSON.stringify({
+    schemaVersion: 2,
+    entries: [{ id: 'kept', bristolType: 4 }],
+    contributions: [{ entryId: 'kept', state: 'queued-local' }],
+  });
+  const result = importLedgerBackup(text);
+
+  assert.equal(result.contributions.length, 0);
+  assert.match(result.notices.join(' '), /could not be read and was skipped/i);
+});

tests/product-decisions.test.js

@@ -21,6 +21,15 @@ test('product decision record fixes the AI boundary and release authority', asyn
   assert.match(decision, /\.\.\/research\/SELF-HOSTED-STOOL-VISION\.md/);
 });
 
+test('the decision record keeps training contribution as its own versioned, withdrawable consent', async () => {
+  const decision = await readFile(decisionPath, 'utf8');
+
+  assert.match(decision, /### Training contribution consent/);
+  assert.match(decision, /never a training contribution/i);
+  assert.match(decision, /withdrawal keeps a tombstone naming every derived artifact by contribution id/i);
+  assert.match(decision, /does not transmit a contribution until the corpus pipeline and privacy copy are reviewed/i);
+});
+
 test('Hermes deployment installs a checked-in non-diagnostic workspace policy', async () => {
   const [policy, readme] = await Promise.all([readFile(policyPath, 'utf8'), readFile(readmePath, 'utf8')]);
   assert.match(policy, /never diagnose/i);
@@ -28,3 +37,16 @@ test('Hermes deployment installs a checked-in non-diagnostic workspace policy',
   assert.match(policy, /explicit user intent and confirmation/i);
   assert.match(readme, /install -m 600 docs\/TIMMY-AGENT-POLICY\.md/);
 });
+
+test('the decision record keeps a backup versioned and refuses files it cannot read', async () => {
+  const decision = await readFile(decisionPath, 'utf8');
+  const readme = await readFile(readmePath, 'utf8');
+
+  assert.match(decision, /### Backup portability and entry provenance/);
+  assert.match(decision, /schema version/i);
+  assert.match(decision, /upgraded on import/i);
+  assert.match(decision, /newer version is refused/i);
+  assert.match(decision, /a refused import leaves the ledger unchanged/i);
+  assert.match(decision, /provenance is stored on the confirmed log/i);
+  assert.match(readme, /versioned JSON backup/i);
+});

tests/release-demo.test.js

@@ -308,3 +308,84 @@ test('release demo shows readiness waiting for the loaded pinned model before AI
   // The caption is a required release gate, so the scene cannot be dropped silently.
   assert.match(builder, /Reachable is not loaded: no AI control, no consent, and no upload until the pinned model is resident/);
 });
+
+test('release demo shows the training contribution as a separate opt-in receipt that can be withdrawn', async () => {
+  const demo = await readFile(demoPath, 'utf8');
+  const builder = await readFile(builderPath, 'utf8');
+  const app = await readFile(new URL('../app.js', import.meta.url), 'utf8');
+
+  // Issue #24: the recording must show the opt-in section, the consent gate, and the withdrawal.
+  assert.match(demo, /\[data-training-consent\]/);
+  assert.match(demo, /\[data-contribute-entry="demo-wipe"\]/);
+  assert.match(demo, /#training-consent-check/);
+  assert.match(demo, /#contribute-confirm/);
+  assert.match(demo, /\[data-contribution-state="queued-local"\]/);
+  assert.match(demo, /data-withdraw=/);
+  assert.match(demo, /\[data-withdrawn-artifacts\]/);
+  assert.match(demo, /training-consent-v1/);
+  // Every claim is measured in the browser before the caption that makes it.
+  assert.match(demo, /a journal save must not queue a training contribution/);
+  assert.match(demo, /the contribute control must stay disabled until the terms are accepted/);
+  assert.match(demo, /no receipt may exist before explicit consent/);
+  assert.match(demo, /a receipt must never copy the photo bytes/);
+  assert.match(demo, /every derived artifact must be addressed by contribution id/);
+  assert.match(demo, /delete-all must clear the contribution receipts as well/);
+  // The controls are the app's own, not demo-only scaffolding.
+  assert.match(app, /data-training-consent/);
+  assert.match(app, /data-contribution-queued-count/);
+  assert.match(app, /id="training-consent-check"/);
+  assert.match(app, /id="contribute-confirm" disabled/);
+  assert.match(app, /data-withdraw=/);
+  // The captions and the gate key are required, so a later release cannot drop the scenes silently.
+  assert.match(builder, /Training contribution is off by default: a saved log is never training data/);
+  assert.match(builder, /The consent version and the receipt are on screen before the contribute button works/);
+  assert.match(builder, /Withdrawing keeps a tombstone naming every derived artifact by contribution ID/);
+  assert.match(builder, /"training_contribution_consent": "passed"/);
+  assert.match(builder, /"test:training-contribution"/);
+});
+
+test('release demo shows a versioned backup, an upgraded older file, and a refused newer one', async () => {
+  const demo = await readFile(demoPath, 'utf8');
+  const builder = await readFile(builderPath, 'utf8');
+  const app = await readFile(new URL('../app.js', import.meta.url), 'utf8');
+
+  // Issue #35: the recording must export the real file, import an older version, refuse a newer one,
+  // and reopen a restored log so its provenance is on screen — not merely described.
+  assert.match(demo, /waitForEvent\('download'\)/);
+  assert.match(demo, /exportedBackup\.schemaVersion !== 2/);
+  assert.match(demo, /the backup must carry the withdrawn receipt as a tombstone/);
+  assert.match(demo, /\[data-portability-notice\]\[data-portability-version="1"\]/);
+  assert.match(demo, /\[data-portability-error\]/);
+  assert.match(demo, /\[data-entry-provenance="ai-corrected"\]/);
+  // Every claim is measured before the caption that makes it.
+  assert.match(demo, /an older backup must be reported as upgraded/);
+  assert.match(demo, /a refused import must not change the ledger it would have replaced/);
+  assert.match(demo, /a restored log must still show that it began as a corrected AI suggestion/);
+  // The controls belong to the app, and the provenance line is its own rendering.
+  assert.match(app, /id="export"/);
+  assert.match(app, /data-portability-notice/);
+  assert.match(app, /data-entry-provenance=/);
+  // Captions and the gate key are required, so a later release cannot drop the scenes silently.
+  assert.match(builder, /A backup is versioned, and it carries the withdrawn receipt as a tombstone rather than silence/);
+  assert.match(builder, /An older backup is upgraded on import, and the notice says which version the file came from/);
+  assert.match(builder, /A file from a newer Timmy is refused with an instruction, and the ledger it would have replaced is untouched/);
+  assert.match(builder, /A restored log still says it began as an AI suggestion you corrected — provenance is part of the record/);
+  assert.match(builder, /"portable_backup_restore": "passed"/);
+  assert.match(builder, /"test:portability"/);
+});
+
+test('the builder refuses to gate or record a release against a foreign server', async () => {
+  const builder = await readFile(builderPath, 'utf8');
+
+  // A leftover checkout answering on the acceptance port once satisfied every flow and the demo,
+  // so the release described a tree that was not the commit under test. The builder must refuse a
+  // live listener before it starts, then prove the served bytes are this tree's before any gate.
+  assert.match(builder, /def assert_port_free/);
+  assert.match(builder, /assert_port_free\("127\.0\.0\.1", 4173\)/);
+  assert.match(builder, /def assert_served_tree/);
+  assert.match(builder, /assert_served_tree\(tree, "127\.0\.0\.1", 4173\)/);
+  const identityCheck = builder.indexOf('assert_served_tree(tree, "127.0.0.1", 4173)');
+  const firstFlow = builder.indexOf('run(["npm", "run", "test:ui"]');
+  assert.ok(identityCheck > 0, 'the served-tree check must be present');
+  assert.ok(firstFlow > identityCheck, 'the served-tree check must run before the first acceptance flow');
+});

tests/service-worker-runtime.test.js

@@ -44,11 +44,14 @@ async function dispatchFetch(handler, request) {
 }
 
 test('root activation deletes only its obsolete Timmy caches including the legacy v4 cache', async () => {
+  // The backup/provenance release (issue #35) changes app.js and src/domain.js, so the shell cache
+  // must advance or an installed client keeps serving the old ledger code indefinitely.
   const { listeners, deleted } = loadWorker({
     cacheKeys: [
       'timmy-shell-v4',
       'timmy-shell:/:v4',
       'timmy-shell:/:v5',
+      'timmy-shell:/:v6',
       'timmy-shell:/timmy-staging/:v4',
       'sibling-shared-origin-cache',
     ],
@@ -56,7 +59,7 @@ test('root activation deletes only its obsolete Timmy caches including the legac
 
   await dispatchExtendable(listeners.get('activate'));
 
-  assert.deepEqual(deleted.sort(), ['timmy-shell-v4', 'timmy-shell:/:v4']);
+  assert.deepEqual(deleted.sort(), ['timmy-shell-v4', 'timmy-shell:/:v4', 'timmy-shell:/:v5']);
 });
 
 test('offline shell lookup uses only the current named cache', async () => {

tests/training-contribution.acceptance.mjs

@@ -0,0 +1,120 @@
+import { chromium } from 'playwright';
+import assert from 'node:assert/strict';
+import { mkdir } from 'node:fs/promises';
+
+// Issue #24 — contributing a confirmed photo to training is a separate opt-in. This runs the real
+// app in a browser: a journal save must record nothing, the consent sheet must show the version and
+// the receipt before the button works, and a withdrawal must leave a tombstone naming every derived
+// artifact. The photo is a synthetic 1x1 PNG constant; no real photo is loaded.
+const SYNTHETIC_PHOTO = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mP8/x8AAwMCAO+ip1sAAAAASUVORK5CYII=';
+const CONSENT_VERSION = 'training-consent-v1';
+
+await mkdir('artifacts', { recursive: true });
+const browser = await chromium.launch({ headless: true });
+const context = await browser.newContext({ viewport: { width: 390, height: 844 }, deviceScaleFactor: 2, serviceWorkers: 'block' });
+const page = await context.newPage();
+const errors = [];
+page.on('console', message => { if (message.type() === 'error') errors.push(message.text()); });
+page.on('pageerror', error => errors.push(error.message));
+page.on('dialog', dialog => dialog.accept());
+await page.goto('http://127.0.0.1:4173', { waitUntil: 'networkidle' });
+await page.evaluate(() => localStorage.clear());
+await page.reload({ waitUntil: 'networkidle' });
+
+const basePath = () => page.evaluate(() => document.querySelector('meta[name="timmy-base-path"]')?.content || '/');
+const storeKey = async suffix => `timmy:${await basePath()}:${suffix}`;
+const readStore = async suffix => {
+  const key = await storeKey(suffix);
+  const raw = await page.evaluate(storeKeys => localStorage.getItem(storeKeys), key);
+  return raw === null ? null : JSON.parse(raw);
+};
+const writeStore = async (suffix, value) => {
+  const key = await storeKey(suffix);
+  await page.evaluate(({ storeKey: k, payload }) => localStorage.setItem(k, payload), { storeKey: key, payload: JSON.stringify(value) });
+};
+
+// 1. Saving a log through the app's own flow contributes nothing.
+await page.locator('[data-log]').first().click();
+await page.locator('[data-type="4"]').click();
+await page.locator('#next').click();
+await page.locator('#note').fill('Synthetic test entry');
+await page.locator('#next').click();
+await page.locator('#save').click();
+await page.getByText(/Private log saved/).waitFor();
+assert.equal(await readStore('training-contributions-v1'), null, 'a journal save must not record a training contribution');
+
+// 2. Seed one photo-bearing log and one text-only log for the privacy section.
+const seeded = [
+  {
+    id: 'demo-photo', occurredAt: new Date(Date.now() - 86400000).toISOString(), bristolType: 4,
+    color: 'brown', urgency: 1, discomfort: 0, note: 'synthetic', photoDataUrl: SYNTHETIC_PHOTO, symptoms: {},
+  },
+  {
+    id: 'demo-text', occurredAt: new Date(Date.now() - 2 * 86400000).toISOString(), bristolType: 3,
+    color: 'brown', urgency: 2, discomfort: 1, note: 'no photo here', photoDataUrl: '', symptoms: {},
+  },
+];
+await writeStore('ledger-v1', seeded);
+await page.reload({ waitUntil: 'networkidle' });
+await page.locator('[data-view="calendar"]').first().click();
+await page.locator('[data-view="privacy"]').first().click();
+await page.getByText(/Your poop\. Your phone\./i).waitFor();
+
+const section = page.locator('[data-training-consent]');
+assert.equal(await section.count(), 1, 'the privacy page must offer the training contribution section');
+assert.match(await section.innerText(), /off by default/i);
+assert.match(await section.innerText(), /nothing is uploaded/i);
+assert.equal((await page.locator('[data-contribution-consent-version]').innerText()).trim(), CONSENT_VERSION);
+assert.equal((await page.locator('[data-contribution-queued-count]').innerText()).trim(), '0');
+assert.equal(await page.locator('[data-contribute-entry="demo-photo"]').count(), 1, 'a saved photo may be contributed');
+assert.equal(await page.locator('[data-contribute-entry="demo-text"]').count(), 0, 'a log without photo bytes cannot be contributed');
+
+// 3. The receipt and the consent version are on screen before the confirm control works.
+await page.locator('[data-contribute-entry="demo-photo"]').click();
+const sheet = page.locator('[data-contribution-sheet]');
+await sheet.waitFor();
+assert.match(await sheet.innerText(), new RegExp(CONSENT_VERSION));
+const receiptId = (await page.locator('[data-receipt-id]').innerText()).trim();
+assert.ok(receiptId.length > 0, 'the receipt shown before consent must name its own id');
+assert.match(await sheet.innerText(), /photo bytes/i);
+assert.match(await sheet.innerText(), /note text/i);
+assert.equal(await page.locator('#contribute-confirm').isDisabled(), true, 'the contribution button stays disabled until the terms are accepted');
+assert.equal(await readStore('training-contributions-v1'), null, 'no receipt may be written before explicit consent');
+await page.screenshot({ path: 'artifacts/training-contribution-consent-mobile.png' });
+
+// 4. Consent records exactly one queued-on-device receipt.
+await page.locator('#training-consent-check').check();
+await page.locator('#contribute-confirm').click();
+await page.getByText(/Queued on this device/i).first().waitFor();
+const queued = await readStore('training-contributions-v1');
+assert.equal(queued.length, 1);
+assert.equal(queued[0].entryId, 'demo-photo');
+assert.equal(queued[0].consentVersion, CONSENT_VERSION);
+assert.equal(queued[0].contributionId, receiptId);
+assert.equal(queued[0].state, 'queued-local');
+assert.equal(JSON.stringify(queued).includes('data:image'), false, 'the receipt must not copy photo bytes');
+assert.equal(JSON.stringify(queued).includes('synthetic'), false, 'the receipt must not copy note text');
+await page.locator('[data-contribution-state="queued-local"]').waitFor();
+assert.equal((await page.locator('[data-contribution-queued-count]').innerText()).trim(), '1');
+await page.screenshot({ path: 'artifacts/training-contribution-queued-mobile.png' });
+
+// 5. Withdrawal leaves a tombstone that addresses every derived artifact by contribution id.
+await page.locator(`[data-withdraw="${receiptId}"]`).click();
+await page.locator('[data-contribution-state="withdrawn"]').waitFor();
+const withdrawn = await readStore('training-contributions-v1');
+assert.equal(withdrawn.length, 1, 'the withdrawn receipt is kept as a tombstone, not silently erased');
+assert.equal(withdrawn[0].state, 'withdrawn');
+assert.ok(withdrawn[0].withdrawnAt, 'the tombstone records when the withdrawal happened');
+assert.deepEqual(withdrawn[0].artifacts.map(artifact => artifact.artifact).sort(), ['confirmed-label', 'raw-image']);
+for (const artifact of withdrawn[0].artifacts) {
+  assert.equal(artifact.contributionId, receiptId);
+  assert.equal(artifact.state, 'withdrawn');
+}
+assert.match(await page.locator('[data-withdrawn-artifacts]').innerText(), /raw image/i);
+assert.equal((await page.locator('[data-contribution-queued-count]').innerText()).trim(), '0');
+await page.screenshot({ path: 'artifacts/training-contribution-withdrawn-mobile.png' });
+
+assert.deepEqual(errors, []);
+await context.close();
+await browser.close();
+console.log('PASS training contribution stays opt-in, shows its consent version before commit, and withdrawal names every derived artifact');

tests/training-contribution.test.js

@@ -0,0 +1,161 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import {
+  TRAINING_CONSENT_VERSION,
+  addContribution,
+  consentTerms,
+  contributionEligibility,
+  contributionForEntry,
+  defaultContributionState,
+  derivedArtifacts,
+  receiptPreview,
+  withdrawContribution,
+} from '../src/training-contribution.js';
+
+// Issue #24 — contributing a photo to Timmy's training corpus is a separate decision from saving
+// a log. Nothing here is transmitted: the receipt is what a person could carry to a corpus pipeline
+// later, and the withdrawal tombstone is what names the artifacts a deletion has to reach.
+
+const PHOTO = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mP8/x8AAwMCAO+ip1sAAAAASUVORK5CYII=';
+const entry = (overrides = {}) => ({
+  id: 'log-1',
+  occurredAt: '2026-10-14T07:20:00.000Z',
+  bristolType: 4,
+  color: 'brown',
+  urgency: 1,
+  discomfort: 0,
+  note: 'after lunch',
+  photoDataUrl: PHOTO,
+  symptoms: { blood: false },
+  ...overrides,
+});
+const preview = (target = entry(), id = 'contrib-1') => receiptPreview(target, {
+  contributionId: id,
+  consentedAt: '2026-10-21T10:00:00.000Z',
+});
+
+test('saving a journal entry contributes nothing by default', () => {
+  assert.deepEqual(defaultContributionState(), { optedIn: false, receipt: null });
+});
+
+test('an entry with no saved photo bytes cannot be contributed', () => {
+  const unavailable = contributionEligibility(entry({ photoDataUrl: '' }));
+  assert.equal(unavailable.eligible, false);
+  assert.match(unavailable.reason, /no saved photo/i);
+  assert.equal(contributionEligibility(entry()).eligible, true);
+});
+
+test('the consent terms name the version and what is never shared', () => {
+  const terms = consentTerms();
+
+  assert.equal(terms.version, TRAINING_CONSENT_VERSION);
+  assert.match(terms.version, /^training-consent-/);
+  assert.ok(terms.includes.some(item => /photo/i.test(item)));
+  assert.ok(terms.excludes.some(item => /note/i.test(item)));
+  assert.ok(terms.excludes.some(item => /symptom/i.test(item)));
+  // This build is honest about transport: a receipt is queued on the device, not uploaded.
+  assert.match(terms.transport, /nothing is uploaded/i);
+});
+
+test('the receipt shown before consent carries the version, the id, and no free text from the log', () => {
+  const receipt = preview();
+
+  assert.equal(receipt.contributionId, 'contrib-1');
+  assert.equal(receipt.consentVersion, TRAINING_CONSENT_VERSION);
+  assert.equal(receipt.consentedAt, '2026-10-21T10:00:00.000Z');
+  assert.deepEqual(receipt.labels, { bristolType: 4, color: 'brown' });
+  assert.equal(receipt.state, 'queued-local');
+  // The confirmed note and symptom flags stay in the journal; they are not part of a contribution.
+  const serialized = JSON.stringify(receipt);
+  assert.equal(serialized.includes('after lunch'), false);
+  assert.equal(serialized.includes('"blood"'), false);
+  assert.equal(serialized.includes('data:image'), false);
+});
+
+test('a receipt cannot be recorded without the current consent version', () => {
+  assert.throws(
+    () => addContribution([], { ...preview(), consentVersion: 'training-consent-v0' }),
+    /consent version/i,
+  );
+});
+
+test('recording a contribution returns a new list and leaves the ledger it was given alone', () => {
+  const before = [];
+  const after = addContribution(before, preview());
+
+  assert.equal(before.length, 0);
+  assert.equal(after.length, 1);
+  assert.equal(after[0].contributionId, 'contrib-1');
+  assert.equal(contributionForEntry(after, 'log-1')?.contributionId, 'contrib-1');
+});
+
+test('the same log cannot be contributed twice while its receipt is still active', () => {
+  const first = addContribution([], preview());
+  const second = addContribution(first, preview(entry(), 'contrib-2'));
+
+  assert.equal(second.length, 1);
+  assert.equal(second[0].contributionId, 'contrib-1');
+});
+
+test('withdrawal keeps a tombstone that names every derived artifact by contribution id', () => {
+  const contributions = addContribution([], preview());
+  const artifacts = derivedArtifacts(contributions[0]);
+
+  const { contributions: after, tombstone } = withdrawContribution(
+    contributions, 'contrib-1', '2026-10-21T11:00:00.000Z',
+  );
+
+  assert.equal(after[0].state, 'withdrawn');
+  assert.equal(after[0].withdrawnAt, '2026-10-21T11:00:00.000Z');
+  assert.equal(tombstone.contributionId, 'contrib-1');
+  assert.deepEqual(
+    tombstone.artifacts.map(artifact => artifact.artifact).sort(),
+    artifacts.map(artifact => artifact.artifact).sort(),
+  );
+  for (const artifact of tombstone.artifacts) {
+    assert.equal(artifact.contributionId, 'contrib-1');
+    assert.equal(artifact.state, 'withdrawn');
+  }
+});
+
+test('the derived artifacts are the image bytes and the confirmed label, addressed by contribution id', () => {
+  const artifacts = derivedArtifacts(preview());
+
+  assert.deepEqual(artifacts.map(artifact => artifact.artifact).sort(), ['confirmed-label', 'raw-image']);
+  for (const artifact of artifacts) {
+    assert.equal(artifact.contributionId, 'contrib-1');
+    assert.equal(artifact.state, 'active');
+  }
+});
+
+test('withdrawing one contribution never touches another receipt', () => {
+  const list = [
+    ...addContribution([], preview()),
+    ...addContribution([], preview(entry({ id: 'log-2' }), 'contrib-2')),
+  ];
+
+  const { contributions: after } = withdrawContribution(list, 'contrib-1', '2026-10-21T11:00:00.000Z');
+
+  assert.equal(after.find(item => item.contributionId === 'contrib-1').state, 'withdrawn');
+  assert.equal(after.find(item => item.contributionId === 'contrib-2').state, 'queued-local');
+});
+
+test('withdrawing an unknown contribution id changes nothing and reports no tombstone', () => {
+  const list = addContribution([], preview());
+  const { contributions: after, tombstone } = withdrawContribution(list, 'missing', '2026-10-21T11:00:00.000Z');
+
+  assert.equal(after, list);
+  assert.equal(tombstone, null);
+});
+
+test('a withdrawn log can be contributed again under a fresh receipt', () => {
+  const { contributions: withdrawn } = withdrawContribution(
+    addContribution([], preview()), 'contrib-1', '2026-10-21T11:00:00.000Z',
+  );
+
+  const again = addContribution(withdrawn, preview(entry(), 'contrib-2'));
+
+  assert.equal(again.length, 2);
+  assert.equal(contributionForEntry(again, 'log-1').contributionId, 'contrib-2');
+  assert.equal(contributionForEntry(again, 'log-1').state, 'queued-local');
+});