BREAKING: Split RequiredArgs into RequiredValueArgs and RequiredBoolArgs (#105)

This change provides more granular control over argument validation by
separating value-based arguments (e.g., --config=value) from boolean
flags (e.g., --verbose).

BREAKING CHANGE: The TOML configuration structure has changed.
- `required_args` is now split into `required_args` (value args) and `required_args_bool` (boolean flags)
- Existing .mcpd.toml files using `required_args` will need to be updated

Changes:
- Split ServerEntry.RequiredArgs into RequiredValueArgs and RequiredBoolArgs
- Add VariableTypeArgBool constant for boolean argument classification
- Add ValueArgument and BoolArgument predicate functions
- Update cmd/add.go to use new argument filtering logic
- Add comprehensive test coverage for new argument types
- Add validation methods for both argument types in runtime.Server
- Update daemon validation to use new Server.Validate() method
- Update printer to display both argument types appropriately
- Enhance registry to properly detect boolean vs value arguments

Author: peteski22

cmd/add.go

@@ -236,14 +236,16 @@ func parseServerEntry(
 	runtimePackageVersion := fmt.Sprintf("%s::%s@%s", selectedRuntime, runtimeSpecificName, v)
 
 	envs := packages.FilterArguments(pkg.Arguments, packages.EnvVar, packages.Required)
-	args := packages.FilterArguments(pkg.Arguments, packages.Argument, packages.Required)
+	args := packages.FilterArguments(pkg.Arguments, packages.ValueArgument, packages.Required)
+	boolArgs := packages.FilterArguments(pkg.Arguments, packages.BoolArgument, packages.Required)
 
 	return config.ServerEntry{
-		Name:            pkg.ID,
-		Package:         runtimePackageVersion,
-		Tools:           requestedTools,
-		RequiredArgs:    args.Names(),
-		RequiredEnvVars: envs.Names(),
+		Name:              pkg.ID,
+		Package:           runtimePackageVersion,
+		Tools:             requestedTools,
+		RequiredValueArgs: args.Names(),
+		RequiredBoolArgs:  boolArgs.Names(),
+		RequiredEnvVars:   envs.Names(),
 	}, nil
 }