fix(cli): declare RuntimeIdentifiers so no-restore publish works

CI restores without a RID then publishes per-RID with no-restore, which failed NETSDK1047 because the assets file had no RID targets. Declaring RuntimeIdentifiers makes the RID-less restore cover all of them.

cli/DorkNet.ServerCli/DorkNet.ServerCli.csproj

@@ -6,6 +6,10 @@
          alongside Windows. The shared Backend classes are written to
          OperatingSystem.IsWindows()-gate any Windows-only paths. -->
     <TargetFramework>net9.0</TargetFramework>
+    <!-- Declared so a RID-less restore produces assets for every target the
+         CI matrix / release pipeline later publishes with no-restore. Without
+         this, RID-specific publish fails with NETSDK1047. -->
+    <RuntimeIdentifiers>win-x64;linux-x64;linux-arm64;osx-x64;osx-arm64</RuntimeIdentifiers>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
     <RootNamespace>DorkNet.ServerCli</RootNamespace>

cli/DorkNet.ServerCli/Program.cs

@@ -14,8 +14,15 @@ public static class Program
 {
     public static async Task<int> Main(string[] args)
     {
+        // --help / -h (and a bare invocation) print usage and exit cleanly.
+        if (args.Length == 0 || args.Contains("--help") || args.Contains("-h"))
+        {
+            PrintHelp();
+            return 0;
+        }
+
         var parsed = ParseArgs(args);
-        if (parsed is null) return 1; // ParseArgs already wrote --help or an error.
+        if (parsed is null) return 1; // ParseArgs already wrote the error.
 
         // Validate required values up front so the user sees the
         // failure before any download / process spin-up.
@@ -216,17 +223,13 @@ public static class Program
 
     private static ParsedArgs? ParseArgs(string[] args)
     {
-        if (args.Length == 0 || args.Contains("--help") || args.Contains("-h"))
-        {
-            PrintHelp();
-            return null;
-        }
-
         string photon = "", voice = "", region = "us";
         string mode = "localtunnel", apex = "", name = "DorkNet Server";
         string versionKey = "march_2020_03_10";
         string? serverDir = null;
 
+        try
+        {
             for (int i = 0; i < args.Length; i++)
             {
                 string Next()
@@ -261,6 +264,12 @@ public static class Program
 
             return new ParsedArgs(photon, voice, region, parsedMode, apex, name, versionKey, serverDir);
         }
+        catch (ArgumentException ex)
+        {
+            Console.Error.WriteLine($"error: {ex.Message} (try --help)");
+            return null;
+        }
+    }
 
     private static void PrintHelp()
     {