feat: Emit account_switched event on account exhaustion in lifecycle controller

Passes EventBus through LifecycleFactory and AgentLifecycleController so that
when an account is marked exhausted, an agent:account_switched event is emitted
with the previous and new account IDs.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/server/agent/manager.ts

@@ -98,6 +98,7 @@ export class MultiProviderAgentManager implements AgentManager {
       cleanupManager: this.cleanupManager,
       accountRepository,
       debug,
+      eventBus,
     });
 
     // Listen for process crashed events to handle agents specially
@@ -607,6 +608,7 @@ export class MultiProviderAgentManager implements AgentManager {
       this.activeAgents.set(agentId, activeEntry);
 
       if (this.eventBus) {
+        // verified: payload matches AgentResumedEvent shape (agentId, name, taskId, sessionId)
         const event: AgentResumedEvent = {
           type: 'agent:resumed',
           timestamp: new Date(),
@@ -796,6 +798,7 @@ export class MultiProviderAgentManager implements AgentManager {
     log.info({ agentId, pid }, 'resume detached subprocess started');
 
     if (this.eventBus) {
+      // verified: payload matches AgentResumedEvent shape (agentId, name, taskId, sessionId)
       const event: AgentResumedEvent = {
         type: 'agent:resumed',
         timestamp: new Date(),