/**
 * Hard-break guard for the legacy `memory.*` configuration shape.
 *
 * memory-as-plugin migration moved every vault-tuning knob
 * (`backend`, half-lives, `embedding`, `recall`, thresholds, …) from the
 * host's `memory.*` namespace to `plugins.memory-vault.*`. Strict Zod parsing
 * would already reject the old shape, but its error message is opaque. This
 * guard runs against the merged raw config before validation and surfaces a
 * targeted message pointing at the migration note.
 */
export declare class LegacyMemoryConfigError extends Error {
    readonly offendingKeys: readonly string[];
    constructor(offendingKeys: readonly string[]);
}
/**
 * Inspect a raw merged config and throw {@link LegacyMemoryConfigError} when
 * any of the moved-or-removed `memory.*` keys are present. No-op when the
 * config has no `memory` block or only the allowed `{enabled, provider}`
 * fields.
 */
export declare function assertNoLegacyMemoryKeys(rawConfig: unknown): void;
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