feat: add zCode Swarm — multi-agent orchestration system

- 6 agent skills: code-review, performance, security, architecture, test, git
- 4 coordinator modes: hierarchical, mesh, gossip, consensus
- Federated memory system (6 namespaces)
- Neural network agent recommendation
- Agent marketplace (plugin discovery/install)
- Real-time dashboard + performance metrics
- CRDT-based sync for decentralized modes
- 22 files, ~1400 lines total

Inspired by ruflo distributed multi-agent patterns.

.zcode/agents/agent-spawner.cjs

@@ -0,0 +1,57 @@
+/**
+ * Agent Spawner
+ * Spawn and manage swarm agents
+ */
+
+class AgentSpawner {
+  constructor(swarm) {
+    this.swarm = swarm;
+    this.activeAgents = new Map();
+  }
+
+  initializeSwarm(agentTypes) {
+    console.log('\n🚀 Initializing swarm agents...');
+    console.log(`   Agent types: ${agentTypes.join(', ')}`);
+    for (const agentType of agentTypes) {
+      this.spawnAgent(agentType);
+    }
+    console.log(`\n✅ Swarm initialized with ${agentTypes.length} agent types`);
+  }
+
+  spawnAgent(agentType) {
+    console.log(`\n📦 Spawning agent: ${agentType}`);
+    const agent = {
+      id: `${agentType}-${Date.now()}`,
+      type: agentType,
+      status: 'idle',
+      createdAt: Date.now()
+    };
+    this.activeAgents.set(agent.id, agent);
+    this.swarm.log('success', `Agent ${agentType} spawned (ID: ${agent.id})`);
+    return agent;
+  }
+
+  getAgent(agentId) { return this.activeAgents.get(agentId); }
+
+  getAgentsByType(agentType) {
+    return Array.from(this.activeAgents.values()).filter(a => a.type === agentType);
+  }
+
+  getActiveAgents() { return Array.from(this.activeAgents.values()); }
+
+  updateAgentStatus(agentId, status) {
+    const agent = this.activeAgents.get(agentId);
+    if (agent) {
+      agent.status = status;
+      this.swarm.log('info', `Agent ${agentId} status → ${status}`);
+    }
+  }
+
+  shutdown() {
+    console.log('\n🛑 Shutting down swarm agents...');
+    this.activeAgents.clear();
+    console.log('✅ All agents stopped');
+  }
+}
+
+module.exports = AgentSpawner;