refactor: Implement dynamic skill loading from definitions, replacing hardcoded skills, and add a new skill management command.

Program.cs

@@ -58,6 +58,9 @@ public class Program
         configCmd.SetHandler(ConfigUpdaterCommand.ExecuteAsync, keyArg, valArg, verboseOption);
         rootCommand.AddCommand(configCmd);
 
+        // Skill Command
+        rootCommand.AddCommand(SkillCommand.CreateCommand(verboseOption));
+
         return await rootCommand.InvokeAsync(args);
     }
 }