Sessions API

interface AgentSession {
  read(path: string): Promise<Bytes>
  write(path: string, bytes: Bytes): Promise<void>
  commit(message: string): Promise<Sha>
  writeAndCommit(opts: { files: Record<string, Bytes>, message: string }): Promise<Sha>
  list(path: string): Promise<Entry[]>
  diff(): Promise<UnifiedDiff>
  log(): Promise<Commit[]>
}

interface UserSession extends AgentSession {
  promote(opts: PromoteOpts): Promise<PromoteResult>
  discard(): Promise<void>
  extend(ttl: Duration): Promise<void>
  forAgent(): AgentSession
}

AgentSession has no promote method by design.