async activeMCPServers() {
    await this.bootMCPServers();
    return Object.keys(this.mcps).flatMap((name) => `@@mcp_${name}`);
  }
Get all of the active MCP servers as plugins we can load into agents.
This will also boot all MCP servers if they have not been started yet.
@returns {Promise<string[]>} Array of flow names in @@mcp_{name} format