feat(confidence-engine): show investigation learning in report

Co-Authored-By: Claude Code <noreply@anthropic.com>

app/investigations/[id]/report/page.jsx

@@ -2,6 +2,7 @@
 
 import React, { useEffect, useRef, useState } from "react";
 import { loadInvestigation, saveInvestigation } from "@/lib/storage/investigation-storage";
+import { deriveInvestigationLearning } from "@/lib/graph/episode-preparation";
 import Link from "next/link";
 
 export default function ReportPage({ params }) {
@@ -191,6 +192,32 @@ export default function ReportPage({ params }) {
             </div>
           )}
 
+          {/* What the investigation surfaced — deterministic learning projection */}
+          {(() => {
+            const learning = deriveInvestigationLearning({
+              situationGraph: existing?.situationGraph,
+              contributions: existing?.focusedContributions ?? [],
+              findings: existing?.findings ?? [],
+            });
+            return learning.length > 0 ? (
+              <div className="mt-6 rounded-xl border-[2.5px] border-teal-300/70 bg-gradient-to-b from-teal-50/60 to-white px-8 pt-6 pb-7 shadow-sm">
+                <h2 className="mb-3 text-[11px] font-bold tracking-[.18em] uppercase text-teal-700/70">
+                  What the investigation surfaced
+                </h2>
+                {learning.map((group, gi) => (
+                  <div key={gi} className="mt-4 space-y-2">
+                    <p className="text-base font-medium text-gray-800">{group.questionText}</p>
+                    {group.propositions.map((prop, pi) => (
+                      <p key={pi} className="text-base leading-relaxed text-gray-700 italic">
+                        {prop.proposition}
+                      </p>
+                    ))}
+                  </div>
+                ))}
+              </div>
+            ) : null;
+          })()}
+
           {/* What remains plausible — conditional */}
           {report.hasPlausibleInterpretations && report.plausibleInterpretations ? (
             <div className="mt-6 rounded-xl border-[2.5px] border-blue-300/70 bg-gradient-to-b from-blue-50/60 to-white px-8 pt-6 pb-7 shadow-sm">