Add compact decision receipt for Ranker handoff

server.js

@@ -1241,6 +1241,15 @@ function createDecisionBrief({ idea, context, mode, ranked, provenance, decision
       sourceQuote: top.provenance?.sourceQuote || '',
     },
   } : 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(' · '),
+    handoffRule: 'Only the Do first item is active. Validate one proof, then re-rank before promoting anything else.',
+  } : null;
   const assumptions = [
     ...(decisionContext?.assumptions || []),
     ...(decisionContext?.constraints || []).map(item => `Constraint: ${item}`),
@@ -1250,6 +1259,7 @@ 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,
+    decisionReceipt,
     source: provenance ? {
       schema: provenance.schema,
       source: provenance.source,