Release 4.12.1: version banner and packaging name

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

RP_L4/RPL4.CPP

@@ -177,7 +177,7 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
       fclose(file);
    }
 
-   DEBUG_STREAM << "Red Planet v4.10" << std::endl << std::flush;
+   DEBUG_STREAM << "Red Planet 4.12.1" << std::endl << std::flush;
    DEBUG_STREAM << "L4CONTROLS=" << getenv("L4CONTROLS") << std::endl << std::flush;
 
 #ifdef RP412_STEAM

pack-dist.ps1

@@ -179,8 +179,8 @@ start rpl4opt.exe -windowed -res 1920 1080
 "@
 
 Set-Content -Path "$dist\README.txt" -Encoding ascii -Value @"
-Red Planet 4.12 - desktop prototype
-===================================
+Red Planet 4.12.1
+=================
 
 Run start-windowed.bat (or: rpl4opt.exe -windowed -res 800 600 -egg TEST.EGG).
 No cockpit hardware needed. If there is no sound, run oalinst.exe once.
@@ -223,7 +223,7 @@ $size = (Get-ChildItem $dist -Recurse | Measure-Object Length -Sum).Sum
 Write-Host ("dist ready: {0:N1} MB" -f ($size / 1MB))
 
 if ($Zip) {
-    $zipPath = Join-Path $root 'dist\RedPlanet412-prototype.zip'
+    $zipPath = Join-Path $root 'RedPlanet-4.12.1.zip'
     Write-Host "zipping to $zipPath..."
     Compress-Archive -Path "$dist\*" -DestinationPath $zipPath -Force
 }