Add source citation copy for Ranker handoff

public/app.js

@@ -197,10 +197,29 @@ function renderLane(ranked, laneId) {
   `;
 }
 
+function sourceCitation(data) {
+  const brief = data.brief || {};
+  const source = brief.source || data.handoff?.source || data.input?.provenance || {};
+  const trace = brief.quickGlance?.sourceTrace || {};
+  const parts = [
+    source.artifactId ? `Artifact: ${source.artifactId}` : '',
+    source.conceptMapId ? `Concept Map: ${source.conceptMapId}` : '',
+    source.snapshotTitle ? `Title: ${source.snapshotTitle}` : '',
+    trace.sourceSection ? `Source section: ${trace.sourceSection}` : '',
+    trace.sourceId ? `Source item: ${trace.sourceId}` : '',
+    trace.sourceTitle ? `Source title: ${trace.sourceTitle}` : '',
+    trace.sourceQuote ? `Source quote: ${trace.sourceQuote}` : '',
+    source.originalPromptExcerpt ? `Original prompt: ${source.originalPromptExcerpt}` : '',
+  ].filter(Boolean);
+  return parts.length ? parts.join('\n') : 'No source citation was carried into this result.';
+}
+
 function markdownBrief(data) {
   const brief = data.brief || {};
   const glance = brief.quickGlance || {};
   const ranked = data.ranked || [];
+  const citation = sourceCitation(data);
+  const hasCitation = !citation.startsWith('No source citation');
   const lanes = ['do', 'test', 'defer', 'park'];
   const laneTitles = { do: 'Do first', test: 'Validate next', defer: 'Defer', park: 'Park / cut' };
   return [
@@ -215,6 +234,7 @@ function markdownBrief(data) {
     `- Evidence question: ${glance.evidenceQuestion || 'n/a'}`,
     `- Biggest trap: ${glance.biggestTrap || 'n/a'}`,
     `- Confidence: ${data.rankConfidence?.level || 'n/a'} — ${data.rankConfidence?.reason || ''}`,
+    ...(hasCitation ? ['', '## Source citation', citation] : []),
     '',
     ...lanes.flatMap((lane) => {
       const items = ranked.filter((item) => item.lane?.id === lane);
@@ -238,6 +258,7 @@ function attachResultActions(data) {
   document.querySelector('#copyBrief')?.addEventListener('click', () => copyText(markdownBrief(data), 'Decision brief'));
   document.querySelector('#copyActions')?.addEventListener('click', () => copyText((data.brief?.next48Hours || []).map((step, index) => `${index + 1}. ${step}`).join('\n'), '48h actions'));
   document.querySelector('#copyJson')?.addEventListener('click', () => copyText(JSON.stringify({ brief: data.brief, ranked: data.ranked, buildOrder: data.buildOrderDetails, handoff: data.handoff }, null, 2), 'JSON handoff'));
+  document.querySelector('#copySource')?.addEventListener('click', () => copyText(sourceCitation(data), 'Source citation'));
 }
 
 function renderResults(data) {
@@ -266,6 +287,7 @@ function renderResults(data) {
       <button class="button ghost" type="button" id="copyBrief">Copy decision brief</button>
       <button class="button ghost" type="button" id="copyActions">Copy 48h actions</button>
       <button class="button ghost" type="button" id="copyJson">Copy JSON handoff</button>
+      <button class="button ghost" type="button" id="copySource">Copy source citation</button>
     </div>
 
     <div class="lane-board">