feat(confidence-engine): separate investigation report routes

components/reasoning-workspace.jsx

@@ -1336,6 +1336,7 @@ export default function ReasoningWorkspace({
   setOverviewState,
   overviewLoading,
   handleRequestOverview,
+  onNavigateToReport,
 }) {
   const [investigationHistory, setInvestigationHistory] = useState([]);
   const turnCounter = useRef(0);
@@ -1956,7 +1957,7 @@ export default function ReasoningWorkspace({
                             </p>
                             <button
                               onClick={() => {
-                                handleRequestOverview();
+                                onNavigateToReport?.();
                               }}
                               disabled={overviewLoading}
                               style={{ cursor: overviewLoading ? "wait" : "pointer" }}

components/scenario-form.jsx

@@ -271,7 +271,7 @@ export async function executeEpisodeDone({
   return { success: true, nextGraph, synthesisResult };
 }
 
-export default function ScenarioForm() {
+export default function ScenarioForm({ onNavigateToReport }) {
   const [scenario, setScenario] = useState("");
   const [status, setStatus] = useState("idle"); // idle | loading | error | success
   const [result, setResult] = useState(null);
@@ -289,6 +289,9 @@ export default function ScenarioForm() {
   const [overviewState, setOverviewState] = useState(null);
   const [overviewLoading, setOverviewLoading] = useState(false);
 
+  /* ── v0.55 — persisted investigation report (derived artefact) ── */
+  const [investigationReport, setInvestigationReport] = useState(null);
+
   /* ── in-flight gate for episode reconsideration on Done ──── */
   const doneInProgressRef = useRef(false);
 
@@ -418,8 +421,8 @@ export default function ScenarioForm() {
   }
 
   /**
-   * v0.54b — request investigation overview via the established POST /api/cases/overview seam.
-   * Transient state only: never persists to SituationGraph or currentUnderstanding.
+   * v0.54b/v0.55 — request investigation overview via the established POST /api/cases/overview seam.
+   * Produces a distinct Investigation Report: a derived artefact, not canonical reasoning state.
    */
   async function handleRequestOverview() {
     if (overviewLoading || !result?.situationGraph) return;
@@ -427,6 +430,9 @@ export default function ScenarioForm() {
     setOverviewLoading(true);
     setOverviewState(null); // clear any previous overview before new request
 
+    const plausibleInput = (result.situationGraph?.reconstruction || {}).plausibleInterpretations ?? [];
+    const hasPlausibleInput = Array.isArray(plausibleInput) && plausibleInput.length > 0;
+
     try {
       const res = await fetch("/api/cases/overview", {
         method: "POST",
@@ -434,12 +440,32 @@ export default function ScenarioForm() {
         body: JSON.stringify({
           situationGraph: result.situationGraph,
           findings,
-          plausibleInterpretations: (result.situationGraph?.reconstruction || {}).plausibleInterpretations ?? [],
+          plausibleInterpretations: plausibleInput,
         }),
       }).then((r) => r.json());
 
       if (res?.success && res?.understanding != null) {
         setOverviewState(res);
+
+        // Persist as a derived artefact of this investigation
+        const report = {
+          understanding: res.understanding,
+          plausibleInterpretations: hasPlausibleInput ? res.plausibleInterpretations ?? "" : "",
+          hasPlausibleInterpretations: hasPlausibleInput,
+        };
+        setInvestigationReport(report);
+
+        // Trigger autosave to persist the report
+        void saveInvestigation({
+          scenario,
+          situationGraph: result.situationGraph,
+          selectedQuestion: result.selectedQuestion,
+          summary: currentUnderstanding,
+          updatedAt: new Date().toISOString(),
+          focusedContributions,
+          findings,
+          investigationReport: report,
+        });
       }
       // On failure: do not clear existing CU, do not block further attempts
     } finally {
@@ -508,6 +534,11 @@ export default function ScenarioForm() {
     setFocusedContributions(saved.focusedContributions || []);
     setFindings(saved.findings || []);
 
+    /* ── v0.55 — hydrate persisted investigation report ─── */
+    if (saved.investigationReport) {
+      setInvestigationReport(saved.investigationReport);
+    }
+
     // Partial sessions (present but no graph) must NOT suppress the
     // scenario-entry form.  Only promote to success when there is actual
     // investigation data to render.
@@ -533,6 +564,7 @@ export default function ScenarioForm() {
       updatedAt: new Date().toISOString(),
       focusedContributions,
       findings,
+      investigationReport,
     });
   }, [
     scenario,
@@ -541,6 +573,7 @@ export default function ScenarioForm() {
     currentUnderstanding,
     focusedContributions,
     findings,
+    investigationReport,
   ]);
 
   /* Restore facilitator dismiss preference (Experiment 05) ─── */
@@ -618,7 +651,7 @@ export default function ScenarioForm() {
         setCurrentUnderstanding(data.summary ?? null);
         const normalised = normaliseStartResult(data);
         setResult(normalised);
-        saveInvestigation({ scenario, situationGraph: normalised.situationGraph, selectedQuestion: normalised.selectedQuestion, summary: data.summary ?? null, updatedAt: new Date().toISOString(), focusedContributions, findings: [] });
+        saveInvestigation({ scenario, situationGraph: normalised.situationGraph, selectedQuestion: normalised.selectedQuestion, summary: data.summary ?? null, updatedAt: new Date().toISOString(), focusedContributions, findings: [], investigationReport });
       } else {
         setStatus("error");
         setCurrentUnderstanding(data.summary ?? null);
@@ -702,7 +735,7 @@ export default function ScenarioForm() {
 
         setAnswer("");
         // Persist after successful update turn — include explicit next state
-        saveInvestigation({ scenario, situationGraph: nextGraph, selectedQuestion: normaliseUpdateSelectedQuestion(outcome.selectedQuestion), summary: currentUnderstanding, updatedAt: new Date().toISOString(), focusedContributions, findings: nextFindings });
+        saveInvestigation({ scenario, situationGraph: nextGraph, selectedQuestion: normaliseUpdateSelectedQuestion(outcome.selectedQuestion), summary: currentUnderstanding, updatedAt: new Date().toISOString(), focusedContributions, findings: nextFindings, investigationReport });
       } else {
         setUpdateStatus("error");
         setUpdateError(outcome);
@@ -852,6 +885,7 @@ export default function ScenarioForm() {
                 setOverviewState={setOverviewState}
                 overviewLoading={overviewLoading}
                 handleRequestOverview={handleRequestOverview}
+                onNavigateToReport={onNavigateToReport}
                 result={{
                   ...(result || {}),
                   situationGraph: updateResult?.updatedSituationGraph ?? result?.situationGraph,