Get Windows IP via cmd.exe ipconfig instead of powershell.exe

powershell.exe interop returns nothing; cmd.exe already proven to work
(used for GITHUB_WORKSPACE). Parse the WSL adapter section of ipconfig.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: TGJLS

.github/workflows/test.yaml

@@ -165,7 +165,7 @@ jobs:
         run: |
           ssh-keygen -t ed25519 -N "" -f ~/.ssh/ci_key
 
-          WINDOWS_IP=$(powershell.exe -noprofile -command "(Get-NetIPAddress -AddressFamily IPv4 | Where-Object {\$_.InterfaceAlias -like '*WSL*'} | Select-Object -First 1).IPAddress" 2>/dev/null | tr -d '\r\n')
+          WINDOWS_IP=$(cmd.exe /c ipconfig 2>/dev/null | tr -d '\r' | awk '/WSL/{f=1} f && /IPv4 Address/{print $NF; exit}')
 
           sshpass -p "$CI_PASS" ssh-copy-id \
             -i ~/.ssh/ci_key.pub \
@@ -177,7 +177,7 @@ jobs:
         run: |
           # Windows → WSL: use the WSL veth IP so the beacon can call home
           WSL_IP=$(hostname -I | awk '{print $1}')
-          WINDOWS_IP=$(powershell.exe -noprofile -command "(Get-NetIPAddress -AddressFamily IPv4 | Where-Object {\$_.InterfaceAlias -like '*WSL*'} | Select-Object -First 1).IPAddress" 2>/dev/null | tr -d '\r\n')
+          WINDOWS_IP=$(cmd.exe /c ipconfig 2>/dev/null | tr -d '\r' | awk '/WSL/{f=1} f && /IPv4 Address/{print $NF; exit}')
 
           cat > /tmp/ci_config.yaml << EOF
           server: