fix: align business reports and record task migration progress

pkg/task/output_test.go

@@ -0,0 +1,35 @@
+package task
+
+import (
+	"context"
+	"strings"
+	"sync"
+	"testing"
+	"unicode/utf8"
+)
+
+func TestOutputIsBoundedConcurrentAndExecutionLocal(t *testing.T) {
+	ctx, output := WithOutput(context.Background())
+	other, separate := WithOutput(context.Background())
+	Logf(other, "独立任务")
+	var workers sync.WaitGroup
+	for i := 0; i < 20; i++ {
+		workers.Add(1)
+		go func() {
+			defer workers.Done()
+			for j := 0; j < 100; j++ {
+				Logf(ctx, "%s", strings.Repeat("渠道", 20))
+				_ = output.String()
+			}
+		}()
+	}
+	workers.Wait()
+	text := output.String()
+	if !utf8.ValidString(text) || len(text) > 3100 || !strings.Contains(text, "已截断") {
+		t.Fatalf("invalid bounded output: bytes=%d", len(text))
+	}
+	if separate.String() != "独立任务" {
+		t.Fatal("execution details leaked between tasks")
+	}
+	Logf(context.Background(), "outside an execution")
+}