Fix Docker Swarm discovery network name mismatch

- Changed NetworkName from 'chorus_default' to 'chorus_net'
- This matches the actual network 'CHORUS_chorus_net' (service prefix added automatically)
- Fixes discovered_count:0 issue - now successfully discovering all 25 agents
- Updated IMPLEMENTATION-SUMMARY with deployment status

Result: All 25 CHORUS agents now discovered successfully via Docker Swarm API

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

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

internal/p2p/discovery.go

@@ -99,7 +99,7 @@ func DefaultDiscoveryConfig() *DiscoveryConfig {
 		DockerEnabled:        true,
 		DockerHost:           "unix:///var/run/docker.sock",
 		ServiceName:          "CHORUS_chorus",
-		NetworkName:          "chorus_default",
+		NetworkName:          "chorus_net", // Match CHORUS_chorus_net (service prefix added automatically)
 		AgentPort:            8080,
 		VerifyHealth:         false, // Set to true for stricter discovery
 		DiscoveryMethod:      discoveryMethod,