docs,config: aggiorna AGENTS.md, config.example, HOST-SETUP.md, checklist faseA e fix vari orchestrator (workstation, build, job, wait, winrm, test)

src/ci_orchestrator/transport/winrm.py

@@ -116,11 +116,15 @@ class WinRmTransport:
             stdout, stderr, returncode = client.execute_ps(script)
         except Exception as exc:
             raise TransportConnectError(f"WinRM execute_ps failed: {exc}") from exc
-        # pypsrp returns stderr as a list of PSRP error records in some versions;
-        # normalise to a string.
+        # pypsrp returns stderr as a PSDataStreams object (newer versions) or a
+        # list of error records (older versions); normalise to a plain string.
         stderr_any: Any = stderr
         if isinstance(stderr_any, str):
             stderr_str = stderr_any
+        elif hasattr(stderr_any, "error"):
+            # PSDataStreams — extract .error records.
+            error_records = getattr(stderr_any, "error", None) or []
+            stderr_str = "\n".join(str(e) for e in error_records)
         else:
             try:
                 stderr_str = "\n".join(str(s) for s in stderr_any)