/** Context about a projection decision for hint generation. */
export interface ProjectionContext {
    readonly projection: "content" | "outline" | "refused";
    readonly reason: string;
    readonly filePath: string;
    readonly fileLines: number;
    readonly fileBytes: number;
    readonly readCount: number;
    readonly changedSinceLastRead?: boolean;
}
/**
 * Generate a teaching hint for a projection decision.
 *
 * Returns undefined when the decision was already optimal (no noise).
 * Pure function — no I/O, no latency impact.
 */
export declare function generateTeachingHint(ctx: ProjectionContext): string | undefined;
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