Replace all Printf logging with structured zerolog in runtime files

Migrates CHORUS logging to 100% structured JSON format with ISO 8601 timestamps
for all runtime-critical subsystems.

Files modified:
- internal/runtime/shared.go: SimpleTaskTracker task completion logging
- api/http_server.go: HTTP server, council opportunity, and status logging
- pubsub/pubsub.go: PubSub initialization, topic management, and message handlers
- discovery/mdns.go: mDNS peer discovery and connection logging

All Printf calls replaced with structured zerolog logging using:
- .Info() for informational messages
- .Warn() for warnings and errors
- .Debug() for verbose debug output
- Structured fields: peer_id, topic_name, council_id, etc.

Version bumped to 0.5.40

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

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

discovery/mdns.go

@@ -5,9 +5,11 @@ import (
 	"fmt"
 	"time"
 
+	"chorus/internal/logging"
 	"github.com/libp2p/go-libp2p/core/host"
 	"github.com/libp2p/go-libp2p/core/peer"
 	"github.com/libp2p/go-libp2p/p2p/discovery/mdns"
+	"github.com/rs/zerolog"
 )
 
 // MDNSDiscovery handles mDNS peer discovery for local network
@@ -18,6 +20,7 @@ type MDNSDiscovery struct {
 	ctx         context.Context
 	cancel      context.CancelFunc
 	serviceTag  string
+	logger      zerolog.Logger
 }
 
 // mdnsNotifee handles discovered peers
@@ -25,6 +28,7 @@ type mdnsNotifee struct {
 	h         host.Host
 	ctx       context.Context
 	peersChan chan peer.AddrInfo
+	logger    zerolog.Logger
 }
 
 // NewMDNSDiscovery creates a new mDNS discovery service
@@ -35,11 +39,14 @@ func NewMDNSDiscovery(ctx context.Context, h host.Host, serviceTag string) (*MDN
 
 	discoveryCtx, cancel := context.WithCancel(ctx)
 
+	logger := logging.ForComponent(logging.ComponentP2P)
+
 	// Create notifee to handle discovered peers
 	notifee := &mdnsNotifee{
 		h:         h,
 		ctx:       discoveryCtx,
 		peersChan: make(chan peer.AddrInfo, 10),
+		logger:    logger,
 	}
 
 	// Create mDNS service
@@ -52,6 +59,7 @@ func NewMDNSDiscovery(ctx context.Context, h host.Host, serviceTag string) (*MDN
 		ctx:        discoveryCtx,
 		cancel:     cancel,
 		serviceTag: serviceTag,
+		logger:     logger,
 	}
 
 	// Start the service
@@ -63,7 +71,7 @@ func NewMDNSDiscovery(ctx context.Context, h host.Host, serviceTag string) (*MDN
 	// Start background peer connection handler
 	go discovery.handleDiscoveredPeers()
 
-	fmt.Printf("🔍 mDNS Discovery started with service tag: %s\n", serviceTag)
+	logger.Info().Str("service_tag", serviceTag).Msg("mDNS Discovery started")
 	return discovery, nil
 }
 
@@ -90,13 +98,13 @@ func (d *MDNSDiscovery) handleDiscoveredPeers() {
 			}
 
 			// Attempt to connect
-			fmt.Printf("🤝 Discovered peer %s, attempting connection...\n", peerInfo.ID.ShortString())
-			
+			d.logger.Info().Str("peer_id", peerInfo.ID.ShortString()).Msg("Discovered peer, attempting connection")
+
 			connectCtx, cancel := context.WithTimeout(d.ctx, 10*time.Second)
 			if err := d.host.Connect(connectCtx, peerInfo); err != nil {
-				fmt.Printf("❌ Failed to connect to peer %s: %v\n", peerInfo.ID.ShortString(), err)
+				d.logger.Warn().Err(err).Str("peer_id", peerInfo.ID.ShortString()).Msg("Failed to connect to peer")
 			} else {
-				fmt.Printf("✅ Successfully connected to peer %s\n", peerInfo.ID.ShortString())
+				d.logger.Info().Str("peer_id", peerInfo.ID.ShortString()).Msg("Successfully connected to peer")
 			}
 			cancel()
 		}
@@ -119,6 +127,6 @@ func (n *mdnsNotifee) HandlePeerFound(pi peer.AddrInfo) {
 		// Peer info sent to channel
 	default:
 		// Channel is full, skip this peer
-		fmt.Printf("⚠️ Discovery channel full, skipping peer %s\n", pi.ID.ShortString())
+		n.logger.Warn().Str("peer_id", pi.ID.ShortString()).Msg("Discovery channel full, skipping peer")
 	}
 }