Fix CI/CD failures: resolve schema file auto-loading issue in smudge operation

Co-authored-by: danielsiegl <41949368+danielsiegl@users.noreply.github.com>

Author: Copilot

.gitsqliteschema

@@ -2,6 +2,7 @@ package filters
 
 import (
 	"context"
+	"fmt"
 	"io"
 	"log/slog"
 	"os"
@@ -51,11 +52,8 @@ func Smudge(ctx context.Context, eng *sqlite.Engine, in io.Reader, out io.Writer
 				return err
 			}
 		} else {
-			slog.Info("Schema file not found, proceeding with data-only restore", "schemaFile", schemaFile)
-			if err := eng.Restore(ctx, tmpPath, in); err != nil {
-				slog.Error("SQLite restore failed", "error", err, "duration", logging.FormatDuration(time.Since(restoreStart)))
-				return err
-			}
+			slog.Error("Schema file specified but not found", "schemaFile", schemaFile)
+			return fmt.Errorf("schema file not found: %s", schemaFile)
 		}
 	} else {
 		// Normal restore without schema file

internal/filters/smudge.go

@@ -143,7 +143,7 @@ func main() {
 		showHelp       = flag.Bool("help", false, "Show help information")
 		floatPrecision = flag.Int("float-precision", 9, "Number of digits after decimal point for float normalization in INSERT statements")
 		dataOnly       = flag.Bool("data-only", false, "For clean/diff: output only data (INSERT statements), no schema")
-		schemaFile     = flag.String("schema-file", ".gitsqliteschema", "For smudge: read schema from this file instead of stdin")
+		schemaFile     = flag.String("schema-file", "", "For smudge: read schema from this file instead of stdin (default: .gitsqliteschema if file exists)")
 		schemaOutput   = flag.String("schema-output", "", "Save schema to this file during clean/diff (default: do not save schema separately)")
 	)
 	flag.Usage = usage