fix: installer tolerates localized 'service exists' (1073) and restarts the service if an upgrade step fails; 1.1.7

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

installer/setup_main.py

@@ -142,10 +142,15 @@ def upgrade_flow(*, install_dir_path: str | None = None, progress: Callable[[str
     progress("Atualizando o Agent (identidade e credenciais preservadas)…")
     if common.service_installed():
         common.ensure_service_stopped()
-    extract_payload(install)
-    common.upgrade_agent_env(install, version)
-    common.install_service(install)
-    common.write_arp_uninstall(install)
+    try:
+        extract_payload(install)
+        common.upgrade_agent_env(install, version)
+        common.install_service(install)
+        common.write_arp_uninstall(install)
+    except Exception as error:  # noqa: BLE001 — never leave the host without a running Agent because an upgrade step failed
+        common.ilog(f"upgrade step failed: {error!r}; restarting the existing service")
+        common.start_and_verify(attempts=2)
+        raise
     os.environ["AGENT_VERSION"] = version
     progress("Iniciando o serviço…")
     common.ilog(f"upgrade to {version} from {existing.get('agent_id')}")