Strengthen rank feedback decision brief

server.js

@@ -598,13 +598,29 @@ function concernFor(option) {
   return 'The main risk is sequencing: do it only if it supports the first useful proof.';
 }
 
-function createDecisionBrief({ idea, context, mode, ranked, provenance }) {
+function whatWouldChangeRanking(top, second, risky) {
+  if (!top) return ['Add at least two concrete next moves with evidence needed.'];
+  const changes = [];
+  if (top.factors?.evidenceNeeded) changes.push(`If evidence fails for “${top.title}” (${top.factors.evidenceNeeded}), move it out of Do first.`);
+  else changes.push(`If “${top.title}” cannot name a cheap proof step, demote it until the evidence question is clear.`);
+  if (second) changes.push(`If “${second.title}” gets stronger proof or meaningfully lower effort, it can overtake the current first move.`);
+  if (risky && risky.id !== top.id) changes.push(`If the riskiest assumption around “${risky.title}” is answered cheaply, re-rank before building around it.`);
+  changes.push('If the source Concept Map adds new constraints or non-goals, re-run the order instead of editing around stale context.');
+  return changes.slice(0, 4);
+}
+
+function createDecisionBrief({ idea, context, mode, ranked, provenance, decisionContext }) {
   const top = ranked[0];
   const second = ranked[1];
   const risky = ranked.slice().sort((a, b) => b.metrics.risk - a.metrics.risk)[0];
   const deferred = ranked.filter(item => ['defer', 'park'].includes(item.lane.id)).slice(0, 3);
   const sourceLabel = [provenance?.snapshotTitle, provenance?.artifactId].filter(Boolean).join(' · ');
   const theme = top ? `The strongest signal is “${top.title}” because ${reasonFor(top)}.` : 'The list needs at least two options before ranking becomes useful.';
+  const assumptions = [
+    ...(decisionContext?.assumptions || []),
+    ...(decisionContext?.constraints || []).map(item => `Constraint: ${item}`),
+    ...(decisionContext?.nonGoals || []).map(item => `Non-goal: ${item}`),
+  ].slice(0, 6);
   return {
     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}.` : ''}`,
@@ -635,6 +651,8 @@ function createDecisionBrief({ idea, context, mode, ranked, provenance }) {
       'Put it in front of 3–5 real people or run it manually once.',
       `Do not touch ${deferred[0] ? `“${deferred[0].title}”` : 'the parked ideas'} until the first signal is real.`,
     ] : ['Paste 3–10 options.', 'Choose what the ranking should care about.', 'Run the first-pass judgement.'],
+    assumptions,
+    whatWouldChangeRanking: whatWouldChangeRanking(top, second, risky),
     caution: 'This is first-pass judgement, not an oracle. Change the criteria if the context changes.',
   };
 }
@@ -701,7 +719,7 @@ app.post('/api/rank-feedback', (req, res) => {
         concern: concernFor(rankedOption),
       };
     });
-  const brief = createDecisionBrief({ idea, context, mode, ranked: options, provenance });
+  const brief = createDecisionBrief({ idea, context, mode, ranked: options, provenance, decisionContext });
   const handoff = createHandoffContract({ ranked: options, provenance, decisionContext });
   res.json({
     ok: true,