fix: resolve 4 bugs found in code review

- report.go: use += instead of = when aggregating status codes by section,
  fixing count loss when multiple codes share the same section (e.g. 200+201)
- charts.go: fix JS syntax error data.push[null] -> data.push(null),
  fixing historical data padding for new status code series
- requester.go: fix off-by-one in ramp-up loop (> to >=),
  preventing an extra goroutine from being launched
- print.go: remove colorize() calls from JSON output functions,
  preventing ANSI escape codes from corrupting JSON

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: six-ddc

charts.go

@@ -119,7 +119,7 @@ function {{ .ViewID }}_sync() {
 					}else{
 						let data = [];
 						for (let i = 0; i < code200Count; i++) {
-							data.push[null];
+							data.push(null);
 						}
 						var newSeries = {
 							name:  code,

print.go

@@ -382,7 +382,6 @@ func (p *Printer) buildJSONErrors(writer *bytes.Buffer, snapshot *SnapshotReport
 	tab1 := strings.Repeat("  ", indent+1)
 	errors := sortMapStrInt(snapshot.Errors)
 	for i, v := range errors {
-		v[1] = colorize(v[1], FgRedColor)
 		vb, _ := json.Marshal(v[0])
 		writer.WriteString(fmt.Sprintf(`%s%s: %s`, tab1, vb, v[1]))
 		if i != len(errors)-1 {
@@ -427,9 +426,6 @@ func (p *Printer) buildJSONSummary(writer *bytes.Buffer, snapshot *SnapshotRepor
 		codes := sortMapStrInt(snapshot.Codes)
 		for _, v := range codes {
 			i++
-			if v[0] != "2xx" {
-				v[1] = colorize(v[1], FgMagentaColor)
-			}
 			writer.WriteString(fmt.Sprintf(`%s"%s": %s`, tab2, v[0], v[1]))
 			if i != len(snapshot.Codes) {
 				writer.WriteString(",")

report.go

@@ -244,7 +244,7 @@ func (s *StreamReport) Snapshot() *SnapshotReport {
 	rs.Codes = make(map[string]int64, len(s.codes))
 	for k, v := range s.codes {
 		section := k / 100
-		rs.Codes[httpStatusSectionLabelMap[section]] = v
+		rs.Codes[httpStatusSectionLabelMap[section]] += v
 	}
 	rs.Errors = make(map[string]int64, len(s.errors))
 	for k, v := range s.errors {

requester.go

@@ -328,7 +328,7 @@ func (r *Requester) Run() {
 	loopCount := int(math.Ceil(float64(r.concurrency) / float64(r.rampUp)))
 	for i := 0; i < loopCount; i++ {
 		for j := 0; j < r.rampUp; j++ {
-			if concurrencyCount > r.concurrency {
+			if concurrencyCount >= r.concurrency {
 				break
 			}
 			concurrencyCount++