Simplify codebase per audit of 0139564

internal/agents/usage.go

@@ -27,7 +27,6 @@ func (m *Manager) loadUsage() {
 	m.mu.Lock()
 	m.usageCommands = cmds
 	m.mu.Unlock()
-	go m.readCodexRateLimit()
 	for _, v := range []api.AgentSessionVendor{api.Claude, api.Codex, api.Antigravity} {
 		go m.readUsage(v)
 	}
@@ -67,9 +66,6 @@ func (m *Manager) SetUsageCommands(ctx context.Context, actor string, c api.Usag
 
 	m.store.Broadcast(api.Event{Kind: "admin.health", Actor: "byre", Payload: map[string]any{}})
 	for _, v := range changed {
-		if v == api.Codex && cmds[v] == "" {
-			go m.readCodexRateLimit()
-		}
 		go m.readUsage(v)
 	}
 	return nil
@@ -84,7 +80,10 @@ func (m *Manager) readUsage(vendor api.AgentSessionVendor) {
 	cmdline := m.usageCommands[vendor]
 	m.mu.Unlock()
 	if cmdline == "" {
-		if vendor == api.Antigravity {
+		switch vendor {
+		case api.Codex:
+			m.readCodexRateLimit()
+		case api.Antigravity:
 			m.readAgyRateLimit()
 		}
 		return