fix aggregate

cmd/cli/main.go

@@ -14,6 +14,7 @@ const usage = `judge — CI/CD testing system for student solutions
 
 Usage:
   judge <tests.jdg> <solution-dir> [flags]
+  judge aggregate <reports-dir>
 
 Flags:
   --json             output as JSON instead of text
@@ -24,10 +25,15 @@ Flags:
 Example:
   judge lab1.jdg ./student-solution
   judge lab1.jdg ./student-solution --json
-  judge lab1.jdg ./student-solution --wrapper "valgrind --error-exitcode=99"
+  judge aggregate reports/
 `
 
 func main() {
+	if len(os.Args) >= 2 && os.Args[1] == "aggregate" {
+		runAggregate()
+		return
+	}
+
 	fs := flag.NewFlagSet("judge", flag.ContinueOnError)
 	fs.SetOutput(os.Stderr)
 	fs.Usage = func() { fmt.Fprint(os.Stderr, usage) }
@@ -85,6 +91,16 @@ func main() {
 	}
 }
 
+func runAggregate() {
+	if len(os.Args) < 3 {
+		fatalf("usage: judge aggregate <reports-dir>")
+	}
+	dir := os.Args[2]
+	if err := reporter.Aggregate(os.Stdout, dir); err != nil {
+		fatalf("%v", err)
+	}
+}
+
 func fatalf(msg string, args ...any) {
 	fmt.Fprintf(os.Stderr, "error: "+msg+"\n", args...)
 	os.Exit(1)