fix(writers): drop version stamps from generated output

Generated files carried the RelSpec version and build date, so every
rebuild produced a diff even when the schema was unchanged.

- bun, gorm, drizzle: remove the GeneratedBy template field and line
- pgsql, mssql, sqlite: emit a constant "-- Generated by RelSpec"
- bun: replace the version header test with a version-free assertion

pkg/buildinfo is unchanged and still backs the CLI version.

pkg/writers/mssql/writer.go

@@ -11,7 +11,6 @@ import (
 
 	_ "github.com/microsoft/go-mssqldb" // MSSQL driver
 
-	"git.warky.dev/wdevs/relspecgo/pkg/buildinfo"
 	"git.warky.dev/wdevs/relspecgo/pkg/models"
 	"git.warky.dev/wdevs/relspecgo/pkg/mssql"
 	"git.warky.dev/wdevs/relspecgo/pkg/writers"
@@ -69,7 +68,7 @@ func (w *Writer) WriteDatabase(db *models.Database) error {
 	// Write header comment
 	fmt.Fprintf(w.writer, "-- MSSQL Database Schema\n")
 	fmt.Fprintf(w.writer, "-- Database: %s\n", db.Name)
-	fmt.Fprintf(w.writer, "-- Generated by %s\n\n", buildinfo.GeneratedComment())
+	fmt.Fprintf(w.writer, "-- Generated by RelSpec\n\n")
 
 	// Process each schema in the database
 	for _, schema := range db.Schemas {
@@ -478,7 +477,7 @@ func (w *Writer) executeDatabaseSQL(db *models.Database, connString string) erro
 	statements := []string{}
 	statements = append(statements, "-- MSSQL Database Schema")
 	statements = append(statements, fmt.Sprintf("-- Database: %s", db.Name))
-	statements = append(statements, "-- Generated by "+buildinfo.GeneratedComment())
+	statements = append(statements, "-- Generated by RelSpec")
 
 	for _, schema := range db.Schemas {
 		if err := w.generateSchemaStatements(schema, &statements); err != nil {