Fix: install Go 1.26.3 directly, use GOTOOLCHAIN=local (no runtime download)

build-windows.ps1

@@ -42,37 +42,49 @@ function Download-File($url, $dest) {
 }
 
 # 1. Go pruefen / als ZIP installieren (kein MSI = kein Exit 1603)
-Write-Host "[1/3] Pruefe Go..."
+# upterm benoetigt Go >= 1.26 - direkt richtige Version installieren
+Write-Host "[1/3] Pruefe Go (benoetigt >= 1.26)..."
 $goRoot    = "C:\Go"
 $goExe     = "$goRoot\bin\go.exe"
+$goVersion = "1.26.3"
 
-if (-not (Test-Path $goExe)) {
-    $goVersion = "1.22.4"
+$needsInstall = $true
+if (Test-Path $goExe) {
+    $verLine = (& $goExe version 2>&1).ToString()
+    if ($verLine -match 'go(\d+)\.(\d+)') {
+        $major = [int]$Matches[1]; $minor = [int]$Matches[2]
+        if ($major -gt 1 -or ($major -eq 1 -and $minor -ge 26)) {
+            $needsInstall = $false
+            Write-Host "      OK ($verLine)"
+        } else {
+            Write-Host "      Go $major.$minor zu alt - aktualisiere auf $goVersion..."
+            Remove-Item -Recurse -Force $goRoot -ErrorAction SilentlyContinue
+        }
+    }
+}
+
+if ($needsInstall) {
     $goZip = "C:\Windows\Temp\go-windows.zip"
     $goUrl = "https://golang.org/dl/go$goVersion.windows-amd64.zip"
-
-    Write-Host "      Go nicht gefunden - lade go$goVersion (ZIP) herunter..."
+    Write-Host "      Lade go$goVersion (ZIP) herunter..."
     if (-not (Download-File $goUrl $goZip)) {
         Read-Host "Enter zum Beenden"; exit 1
     }
-
     Write-Host "      Entpacke nach $goRoot ..."
     if (Test-Path $goRoot) { Remove-Item -Recurse -Force $goRoot }
     Expand-Archive -Path $goZip -DestinationPath "C:\" -Force
     Remove-Item $goZip -ErrorAction SilentlyContinue
-
     if (-not (Test-Path $goExe)) {
         Write-Host "FEHLER: go.exe nach Entpacken nicht gefunden."
         Read-Host "Enter zum Beenden"; exit 1
     }
+    Write-Host "      OK (go$goVersion installiert)"
 }
 
 # Go in PATH dieser Session
 if ($env:PATH -notlike "*$goRoot\bin*") {
     $env:PATH = "$env:PATH;$goRoot\bin"
 }
-$goVer = & $goExe version 2>&1
-Write-Host "      OK ($goVer)"
 
 # 2. upterm bauen via Quellcode-ZIP
 # (go install erlaubt keine replace-Direktiven in externen Modulen)
@@ -104,7 +116,7 @@ $env:TMP       = "C:\GoTemp"
 $env:GOCACHE   = "C:\GoCache"
 $env:GOTMPDIR  = "C:\GoTemp"
 Push-Location $repoDir
-$env:GOTOOLCHAIN = "auto"
+$env:GOTOOLCHAIN = "local"
 & $goExe build -o "$env:GOPATH\bin\upterm.exe" ./cmd/upterm 2>&1 | ForEach-Object { Write-Host "      $_" }
 $buildExit = $LASTEXITCODE
 Pop-Location