fix self-Join nil-map panic by skipping local PID in Join and guarding handleVoteReply

Author: halturin

health/example/go.mod

@@ -1,6 +1,6 @@
 module ergo.services/actor/health/example
 
-go 1.20
+go 1.21
 
 require (
 	ergo.services/actor/health v0.0.0

health/go.mod

@@ -1,5 +1,5 @@
 module ergo.services/actor/health
 
-go 1.20
+go 1.21
 
 require ergo.services/ergo v1.999.321-0.20260323195702-0be2846405c2

leader/leader.go

@@ -376,6 +376,9 @@ func (l *Actor) BroadcastBootstrap(message any) {
 // Join adds a peer to the cluster
 // Use this to manually add known peers or for dynamic cluster growth
 func (l *Actor) Join(peer gen.ProcessID) {
+	if peer.Node == l.Node().Name() && peer.Name == l.Name() {
+		return
+	}
 	l.Send(peer, msgVote{
 		ClusterID: l.clusterID,
 		Term:      l.term,
@@ -509,6 +512,10 @@ func (l *Actor) handleVoteReply(from gen.PID, msg msgVoteReply) error {
 		return nil
 	}
 
+	if l.votesReceived == nil {
+		return nil
+	}
+
 	// track this vote
 	l.votesReceived[from] = true
 

metrics/example/go.mod

@@ -1,6 +1,6 @@
 module ergo.services/actor/metrics/example
 
-go 1.20
+go 1.21
 
 require (
 	ergo.services/actor/metrics v0.0.0

metrics/go.mod

@@ -1,6 +1,6 @@
 module ergo.services/actor/metrics
 
-go 1.20
+go 1.21
 
 require (
 	ergo.services/ergo v1.999.321-0.20260323195702-0be2846405c2