feat(confidence-engine): use server investigation persistence

lib/storage/server-investigation-persistence.js

@@ -2,6 +2,7 @@ import {
   createServerSupabaseClient,
   getAuthenticatedUser,
 } from "@/lib/supabase/server.js";
+import { restartSnapshot } from "./restart-investigation.js";
 
 const SCHEMA = "confidence_engine";
 const TABLE = "investigations";
@@ -50,17 +51,26 @@ export async function loadInvestigation(id) {
 
 export async function listInvestigations() {
   const context = await getAuthenticatedPersistenceContext();
-  if (!context) return null;
+  if (!context) return [];
 
   const { data, error } = await context.supabase
     .schema(SCHEMA)
     .from(TABLE)
-    .select("id, created_at, updated_at")
+    .select("id, snapshot, created_at, updated_at")
     .order("updated_at", { ascending: false });
   throwIfDatabaseError(error);
   return (data ?? []).map((record) => ({
     id: record.id,
-    createdAt: record.created_at,
-    updatedAt: record.updated_at,
+    scenario: record.snapshot?.scenario ?? null,
+    updatedAt: record.snapshot?.updatedAt ?? record.updated_at,
+    investigationRevision: record.snapshot?.investigationRevision ?? 0,
+    reportExists: !!record.snapshot?.investigationReport,
+    reportGeneratedFromRevision: record.snapshot?.investigationReport?.generatedFromRevision ?? null,
   }));
+}
+
+export async function restartInvestigation(id) {
+  const snapshot = await loadInvestigation(id);
+  if (!snapshot) return null;
+  return saveInvestigation(restartSnapshot(snapshot), id);
 }