fix: harden embedded Pi lifecycle recovery

backend/test/routes-sessions.test.ts

@@ -170,15 +170,25 @@ test("maintenance endpoints report marker-derived state after post-rename and po
 
     const activated = await app.inject({ method: "POST", url: "/internal/maintenance/activate" });
     expect(activated.statusCode).toBe(500);
-    expect(activated.json()).toMatchObject({ active: true, admissions: 0 });
+    expect(activated.json()).toMatchObject({
+      active: true,
+      admissions: 0,
+      recoveryRequired: true,
+      code: "maintenance_durability_failed",
+    });
 
     failSync = false;
     expect((await app.inject({ method: "GET", url: "/internal/maintenance/status" })).json())
-      .toEqual({ active: true, admissions: 0 });
+      .toEqual({ active: true, admissions: 0, recoveryRequired: true });
     failSync = true;
     const deactivated = await app.inject({ method: "POST", url: "/internal/maintenance/deactivate" });
     expect(deactivated.statusCode).toBe(500);
-    expect(deactivated.json()).toMatchObject({ active: false, admissions: 0 });
+    expect(deactivated.json()).toMatchObject({
+      active: true,
+      admissions: 0,
+      recoveryRequired: true,
+      code: "maintenance_durability_failed",
+    });
   } finally {
     rmSync(dir, { recursive: true, force: true });
   }