Ensure execution order of suites is deterministic

Sort test suites alphabetically based on their json file names before execution.

Author: stringintech

cmd/runner/main.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"io/fs"
 	"os"
+	"sort"
 	"strings"
 	"time"
 
@@ -37,6 +38,9 @@ func main() {
 		os.Exit(1)
 	}
 
+	// Sort test files alphabetically for deterministic execution order
+	sort.Strings(testFiles)
+
 	// Create test runner
 	testRunner, err := runner.NewTestRunner(*handlerPath, *handlerTimeout, *timeout)
 	if err != nil {