fix(poll): fetch task before sleeping to avoid startup delay

- Reorder pollOnce to fetch first and sleep after, matching the
  original rate.Limiter burst=1 behavior where the first poll
  returns immediately
- Remove unused ReportInterval config field that was never shipped

internal/app/poll/poller.go

@@ -157,17 +157,16 @@ func addJitter(d time.Duration) time.Duration {
 
 func (p *Poller) pollOnce() {
 	for {
-		interval := addJitter(p.calculateInterval())
-		timer := time.NewTimer(interval)
-		select {
-		case <-timer.C:
-		case <-p.pollingCtx.Done():
-			timer.Stop()
-			return
-		}
-
 		task, ok := p.fetchTask(p.pollingCtx)
 		if !ok {
+			interval := addJitter(p.calculateInterval())
+			timer := time.NewTimer(interval)
+			select {
+			case <-timer.C:
+			case <-p.pollingCtx.Done():
+				timer.Stop()
+				return
+			}
 			continue
 		}
 

internal/pkg/config/config.go

@@ -32,7 +32,6 @@ type Runner struct {
 	FetchTimeout        time.Duration     `yaml:"fetch_timeout"`          // FetchTimeout specifies the timeout duration for fetching resources.
 	FetchInterval       time.Duration     `yaml:"fetch_interval"`         // FetchInterval specifies the interval duration for fetching resources.
 	FetchIntervalMax    time.Duration     `yaml:"fetch_interval_max"`     // FetchIntervalMax specifies the maximum backoff interval when idle.
-	ReportInterval      time.Duration     `yaml:"report_interval"`        // Deprecated: use LogReportInterval and StateReportInterval instead.
 	LogReportInterval   time.Duration     `yaml:"log_report_interval"`    // LogReportInterval specifies the base interval for periodic log flush.
 	LogReportMaxLatency time.Duration     `yaml:"log_report_max_latency"` // LogReportMaxLatency specifies the max time a log row can wait before being sent.
 	LogReportBatchSize  int               `yaml:"log_report_batch_size"`  // LogReportBatchSize triggers immediate log flush when buffer reaches this size.