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/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++