feat: add investigation map workspace view

components/reasoning-workspace.jsx

@@ -5,6 +5,7 @@ import DiagnosticsView from "@/components/diagnostics-view";
 import GraphUpdateView from "@/components/graph-update-view";
 import SituationGraphView from "@/components/situation-graph-view";
 import InvestigationSummaryPanel from "@/components/investigation-summary-panel";
+import InvestigationMap from "@/components/investigation-map";
 
 // ── Technical summary detector (main view filters these) ───
 const TECHNICAL_PATTERNS = [
@@ -733,6 +734,11 @@ export default function ReasoningWorkspace({
             <CurrentUnderstandingCard currentSummary={graph?.currentSummary || result?.updatedSituationGraph?.currentSummary} plainLanguage={propUnderstanding || null} />
           )}
 
+          {/* ── Investigation Map (visible during active investigation) ─ */}
+          {hasSelectedQuestion && (
+            <InvestigationMap turnCount={investigationHistory.length} />
+          )}
+
           <OriginalSituation scenario={scenario} centralStatement={graph?.centralStatement} />
 
           {investigationHistory.length > 0 && <InvestigationHistory turns={investigationHistory} />}