DMD-921 - Add Version type for format version constants

Define a typed constant for TwinFormatVersion and FormatVersion for
better type safety.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: vojtabiberle

internal/pkg/llm/twinformat/generator.go

@@ -15,11 +15,14 @@ import (
 	"github.com/keboola/keboola-as-code/internal/pkg/utils/timeutils"
 )
 
+// Version represents a format version number.
+type Version int
+
 const (
 	// TwinFormatVersion is the version of the twin format specification.
-	TwinFormatVersion = 1
+	TwinFormatVersion Version = 1
 	// FormatVersion is the version of the output format.
-	FormatVersion = 2
+	FormatVersion Version = 2
 )
 
 // GeneratorDependencies defines the dependencies for the Generator.