style: fix golangci-lint formatting issues

- Run gofmt on all swarm package files
- Fix unnecessary int64 conversion in metrics.go
- Break long line in leader_election.go for golines

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

pkg/swarm/leader_election.go

@@ -178,7 +178,8 @@ func (le *LeaderElection) monitorLeader() {
 
 	// Check if leader is still in the membership
 	if _, exists := le.membership.GetNode(leaderID); !exists {
-		logger.WarnCF("swarm", "Leader no longer in membership, triggering reelection", map[string]any{"leader_id": leaderID})
+		logger.WarnCF("swarm", "Leader no longer in membership, triggering reelection",
+			map[string]any{"leader_id": leaderID})
 		// Trigger reelection by clearing current leader
 		le.mu.Lock()
 		le.currentLeader = ""

pkg/swarm/load_monitor.go

@@ -245,7 +245,7 @@ func (lm *LoadMonitor) GetTrend() string {
 
 	// Simple linear regression to detect trend
 	n := float64(len(lm.samples))
-	sumX := n*(n-1)/2
+	sumX := n * (n - 1) / 2
 	sumY := 0.0
 	sumXY := 0.0
 
@@ -255,7 +255,7 @@ func (lm *LoadMonitor) GetTrend() string {
 		sumXY += x * s
 	}
 
-	slope := (n*sumXY - sumX*sumY) / (n*(n-1)*(2*n-1)/6)
+	slope := (n*sumXY - sumX*sumY) / (n * (n - 1) * (2*n - 1) / 6)
 
 	if slope > TrendIncreasingThreshold {
 		return "increasing"

pkg/swarm/metrics.go

@@ -118,7 +118,7 @@ func (m *MetricsCollector) RecordLatency(operation string, latency time.Duration
 	bucket := m.latencyBuckets[operation]
 	m.mu.Unlock()
 
-	ms := int64(latency.Milliseconds())
+	ms := latency.Milliseconds()
 
 	bucket.mu.Lock()
 	bucket.count++
@@ -205,7 +205,7 @@ func (m *MetricsCollector) percentile(bucket *LatencyBucket, p float64) float64
 	cumulative := int64(0)
 
 	// Upper bounds for each bucket in ms
-	upperBounds := []int64{1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 1<<62}
+	upperBounds := []int64{1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 1 << 62}
 
 	for i, count := range bucket.buckets {
 		cumulative += count