/**
 * Compare a model string derived from past messages against the current actor
 * model. Persisted messages from older code paths may carry a bare `modelId`
 * (no `provider/` prefix) while the current actor always formats as
 * `provider/modelId`. If either side is bare, fall back to comparing just the
 * `modelId` part so a missing provider in history doesn't trigger a spurious
 * provider change.
 */
export declare function didProviderChange(actorModel?: string, lastModel?: string): boolean;
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