fix: Restore P2P connectivity by simplifying libp2p configuration

ISSUE RESOLVED: All 9 CHORUS containers were showing "0 connected peers"
and elections were completely broken with "❌ No winner found in election"

ROOT CAUSE: During Task Execution Engine implementation, ConnectionManager
and AutoRelay configuration was added to p2p/node.go, which broke P2P
connectivity in Docker Swarm overlay networks.

SOLUTION: Reverted to simple libp2p configuration from working baseline:
- Removed connmgr.NewConnManager() setup
- Removed libp2p.ConnectionManager(connManager)
- Removed libp2p.EnableAutoRelayWithStaticRelays()
- Kept only basic libp2p.EnableRelay()

VERIFICATION: All containers now show 3-4 connected peers and elections
are fully functional with candidacy announcements and voting.

PRESERVED: All Task Execution Engine functionality (v0.5.0) remains intact

🤖 Generated with [Claude Code](https://claude.ai/code)

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

p2p/node.go

@@ -11,7 +11,6 @@ import (
 	kaddht "github.com/libp2p/go-libp2p-kad-dht"
 	"github.com/libp2p/go-libp2p/core/host"
 	"github.com/libp2p/go-libp2p/core/peer"
-	"github.com/libp2p/go-libp2p/p2p/net/connmgr"
 	"github.com/libp2p/go-libp2p/p2p/security/noise"
 	"github.com/libp2p/go-libp2p/p2p/transport/tcp"
 	"github.com/multiformats/go-multiaddr"
@@ -46,26 +45,13 @@ func NewNode(ctx context.Context, opts ...Option) (*Node, error) {
 		listenAddrs = append(listenAddrs, ma)
 	}
 
-	// Create connection manager with scaling-optimized limits
-	connManager, err := connmgr.NewConnManager(
-		config.LowWatermark,                     // Low watermark (32)
-		config.HighWatermark,                    // High watermark (128)
-		connmgr.WithGracePeriod(30*time.Second), // Grace period before pruning
-	)
-	if err != nil {
-		cancel()
-		return nil, fmt.Errorf("failed to create connection manager: %w", err)
-	}
-
-	// Create libp2p host with security, transport, and scaling options
+	// Create libp2p host with security and transport options
 	h, err := libp2p.New(
 		libp2p.ListenAddrs(listenAddrs...),
 		libp2p.Security(noise.ID, noise.New),
 		libp2p.Transport(tcp.NewTCPTransport),
 		libp2p.DefaultMuxers,
 		libp2p.EnableRelay(),
-		libp2p.ConnectionManager(connManager), // Add connection management
-		libp2p.EnableAutoRelayWithStaticRelays([]peer.AddrInfo{}), // Enable AutoRelay with empty static list
 	)
 	if err != nil {
 		cancel()