Run Windows training agent without console

tools/install_windows_training_agent.ps1

@@ -40,6 +40,15 @@ function Resolve-Python {
     throw "Python was not found. Create .venv or install Python 3.12."
 }
 
+function Resolve-WindowlessPython {
+    $python = Resolve-Python
+    $pythonw = Join-Path (Split-Path -Parent $python) "pythonw.exe"
+    if (Test-Path $pythonw) {
+        return $pythonw
+    }
+    return $python
+}
+
 if ($ApiAuth) {
     [Environment]::SetEnvironmentVariable("TRADEBOT_API_AUTH", $ApiAuth, "User")
     $env:TRADEBOT_API_AUTH = $ApiAuth
@@ -59,7 +68,7 @@ if (-not $KeepLegacyRetrainer) {
     }
 }
 
-$python = Resolve-Python
+$python = Resolve-WindowlessPython
 $currentUser = [System.Security.Principal.WindowsIdentity]::GetCurrent().Name
 $arguments = @(
     "-u",

tools/windows_training_agent.py

@@ -296,7 +296,11 @@ def log(path: Path, message: str) -> None:
     path.parent.mkdir(parents=True, exist_ok=True)
     stamp = datetime.now().astimezone().isoformat(timespec="seconds")
     line = f"[{stamp}] {message}"
-    print(line, flush=True)
+    if sys.stdout is not None:
+        try:
+            print(line, flush=True)
+        except OSError:
+            pass
     with path.open("a", encoding="utf-8") as handle:
         handle.write(line + "\n")