fix(resume): recover cleanly after Pi exits

backend/src/routes/sessions.ts

@@ -106,8 +106,6 @@ export function sessionRoutes(
       if (state === "running" || state === "waiting") {
         return reply.code(200).send({ id, alreadyActive: true });
       }
-      d.mgr.teardown(id);
-      d.hub.clear(id);
     }
     const manifest = (await d.tht.sessionShow(id, d.getSettings().workspace)) as { status?: string; archived?: boolean } | null;
     if (manifest?.status === "finalized" || manifest?.archived) {
@@ -124,6 +122,8 @@ export function sessionRoutes(
       author: getUser(req).id,
       mode: "resume" as const,
     };
+    if (existing) d.mgr.teardown(id);
+    d.hub.clear(id);
     await d.tht.reopenSession(id, settings.workspace);
     const rt = d.mgr.createFor(id, options);
     bindRuntime(id, rt);