release v0.9.4

This release updates the Marcer GameDVD Launcher with the following changes:

Bug Fixes:
- Fix Hatari.ConfigFile placeholder handling when empty (use bundled config from current directory)
- Add Hatari.ArgsTemplate validation in constructor
- Fix MenuRenderer.RedrawEntry() bounds checking on console resize
- Fix RightArrow key binding documentation

Features:
- Add bundled Hatari configuration file (MarcerGameDvd-Hatari.cfg)
- Make Hatari.ConfigFile optional with automatic fallback (uses current directory)
- Add RightArrow key support (alias for Enter)

Documentation:
- Update AGENTS.md with new RightArrow key binding
- Update README.md to clarify optional Hatari.ConfigFile
- Create BUGS.md with known issues and fixes

Code Improvements:
- Centralize magic strings and constants
- Add AvailableLines helper for console height
- Make color scheme fully configurable
- Improve Win32 constants documentation

The launcher now provides a more robust and configurable experience with proper error handling.

src/MarcerGameDvdLauncher/LauncherApp.cs

@@ -65,9 +65,10 @@ namespace MarcerGameDvdLauncher
 
             // If no Hatari config file was specified, fall back to the bundled
             // MarcerGameDvd-Hatari.cfg that ships with the launcher.
+            // Use current working directory to allow running from different locations
             if (string.IsNullOrWhiteSpace(cfg.Hatari.ConfigFile))
             {
-                cfg.Hatari.ConfigFile = Path.Combine(exeDir, HatariLauncher.DefaultConfigFile);
+                cfg.Hatari.ConfigFile = Path.Combine(Directory.GetCurrentDirectory(), HatariLauncher.DefaultConfigFile);
             }
 
             // Validate the Hatari config file (either user-specified or bundled fallback)