fix(test): reject group report flag values

scripts/test-group-report.mjs

@@ -64,7 +64,7 @@ function usage() {
 
 function readRequiredValue(argv, index, flag) {
   const value = argv[index + 1];
-  if (!value || value.startsWith("--")) {
+  if (!value || value.startsWith("-")) {
     throw new Error(`${flag} requires a value`);
   }
   return value;

test/scripts/test-group-report.test.ts

@@ -592,6 +592,7 @@ describe("scripts/test-group-report arg parsing", () => {
       expect(() => parseTestGroupReportArgs([flag, "--limit", "5"])).toThrow(
         `${flag} requires a value`,
       );
+      expect(() => parseTestGroupReportArgs([flag, "-h"])).toThrow(`${flag} requires a value`);
     }
     for (const flag of [
       "--limit",