/**
 * Multi-account data model.
 *
 * Each AccountSpec is a self-contained mail-server definition: provider
 * type, IMAP/SMTP host+port, credentials, optional TLS cert. The overall
 * server picks one "active" account to wire into the singleton IMAP/SMTP
 * services. Switching the active account currently requires a server
 * restart — a full service-layer refactor that lets a single running
 * process speak to multiple accounts concurrently is tracked as future
 * work (would let tools take an optional `account_id` argument).
 *
 * The shape is deliberately similar to the existing top-level
 * ConnectionSettings so migration is mechanical.
 */
export {};
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