export type AgentDensity = "comfortable" | "compact";
export type AgentMessageRole = "assistant" | "user" | "system" | "tool";
export type AgentRunState = "idle" | "ready" | "running" | "paused" | "error";
export type AgentStepState = "pending" | "running" | "done" | "error";
export type AgentSurfaceTone = "neutral" | "accent" | "success" | "warning" | "danger";
