Add active slice first-screen receipt

server.js

@@ -1622,13 +1622,24 @@ function createDecisionBrief({ idea, context, mode, ranked, provenance, decision
       sourceQuote: top.provenance?.sourceQuote || '',
     },
   } : null;
+  const activeSourceAnchor = [top?.provenance?.sourceSection, top?.provenance?.sourceId || top?.provenance?.sourceTitle].filter(Boolean).join(' · ');
+  const firstScreen = top ? {
+    headline: `Build only this first: ${top.title}`,
+    primaryAction: nextStepFor(top),
+    proofQuestion: evidenceQuestionFor(top),
+    why: reasonFor(top),
+    sourceAnchor: activeSourceAnchor,
+    holdBack: deferred.slice(0, 3).map(item => ({ title: item.title, lane: item.lane?.label || 'Not now', reason: reasonFor(item) })),
+    guardrails: (decisionContext?.nonGoals || []).slice(0, 3),
+    rule: 'One active move. Everything else waits until this proof produces evidence.',
+  } : null;
   const decisionReceipt = top ? {
     activeMove: top.title,
     activeLane: top.lane?.label || 'Do first',
     firstProofStep: nextStepFor(top),
     evidenceQuestion: evidenceQuestionFor(top),
     doNotStartYet: deferred.slice(0, 3).map(item => item.title),
-    sourceAnchor: [top.provenance?.sourceSection, top.provenance?.sourceId || top.provenance?.sourceTitle].filter(Boolean).join(' · '),
+    sourceAnchor: activeSourceAnchor,
     handoffRule: 'Only the Do first item is active. Validate one proof, then re-rank before promoting anything else.',
   } : null;
   const assumptions = [
@@ -1640,6 +1651,7 @@ function createDecisionBrief({ idea, context, mode, ranked, provenance, decision
     headline: top ? `Start with ${top.title}` : 'Add options to get a ranked feedback map',
     summary: `${theme}${second ? ` “${second.title}” is the nearest follow-up, not a parallel first step.` : ''}${sourceLabel ? ` Source: ${sourceLabel}.` : ''}`,
     quickGlance,
+    firstScreen,
     decisionReceipt,
     source: provenance ? {
       schema: provenance.schema,