Release 4.12.3

Version string, zip name and README. This one is about the screen:
the cockpit scales both ways and re-fits on resize keeping 16:9, -fit
runs it borderless over the monitor at a matched render size, the six
secondary displays are the players to scale and the radar to place,
and the button banks reach under the glass.

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

README.md

@@ -24,13 +24,23 @@ behind the engine's existing seams.
 | WinSock TCP LAN mesh | **NetTransport seam** — the deterministic pod mesh unchanged, running over plain TCP (LAN/dev) or **Steam Networking Sockets** (FakeIP + Steam Datagram Relay) |
 | Site network / fixed IPs | **Steam lobbies** — lobby owner is the console; members exchange FakeIPs and loadouts as lobby data |
 
-**Status: it works.** Release
+**Status: it works.**
 [v4.12.2](https://gitea.mysticmachines.com/VWE/RP412/releases/tag/v4.12.2)
-carries the first verified end-to-end internet build: three machines, three
+carried the first verified end-to-end internet build: three machines, three
 Steam accounts, lobby → mesh → marshaled five-minute race → deaths and
 respawns → timed stop → results on every machine → rematch from the same
 lobby.
 
+[v4.12.3](https://gitea.mysticmachines.com/VWE/RP412/releases/tag/v4.12.3)
+is about the screen. The cockpit now scales up as well as down and re-fits
+whenever the window changes, keeping 16:9 so a wide panel letterboxes
+instead of stretching; `-fit` runs it borderless over the whole monitor and
+picks the render size to land on the viewscreen 1:1. The displays are the
+player's to arrange — each of the six can be scaled on its own and the
+radar moved out of the middle of the road (`environ.ini`). Each display's
+button bank now reaches under its glass, so the picture itself is the press
+target rather than a sliver at the edge.
+
 ## Playing
 
 Grab the release zip (or run `pack-dist.ps1` on a build). Single player:

RP_L4/RPL4.CPP

@@ -177,7 +177,7 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
       fclose(file);
    }
 
-   DEBUG_STREAM << "Red Planet 4.12.2" << std::endl << std::flush;
+   DEBUG_STREAM << "Red Planet 4.12.3" << std::endl << std::flush;
    DEBUG_STREAM << "L4CONTROLS=" << getenv("L4CONTROLS") << std::endl << std::flush;
 
 #ifdef RP412_STEAM

pack-dist.ps1

@@ -305,7 +305,7 @@ start rpl4opt.exe -fit
 "@
 
 Set-Content -Path "$dist\README.txt" -Encoding ascii -Value @"
-Red Planet 4.12.2
+Red Planet 4.12.3
 =================
 
 Run start-fullscreen.bat for borderless over the whole monitor, or
@@ -367,7 +367,7 @@ $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 'RedPlanet-4.12.2.zip'
+    $zipPath = Join-Path $root 'RedPlanet-4.12.3.zip'
     Write-Host "zipping to $zipPath..."
 
     # Everything lives under a single RP412\ folder inside the zip, so