fix: fresh install archives stale state of a previous installation; a fatal Agent loop error stops the service instead of leaving a dead 'Running' one; 1.2.3

Found by uninstall + fresh install on the clean Windows Sandbox: the old agent_state.sqlite identity conflicted with the new enrollment and the service sat idle.

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

installer/setup_main.py

@@ -106,6 +106,7 @@ def install_flow(code: str, *, hub: str | None = None, install_dir_path: str | N
 
     progress("Instalando o serviço…")
     extract_payload(install)
+    common.archive_stale_state(install)
 
     started = heartbeat = False
     service_detail = ""