/**
 * Acquire the process-local compaction slot for one native AgentSession.
 *
 * Pi's compact() method does not reject overlapping calls before its first await,
 * so plugins coordinating only with their own instance-local flags can overwrite
 * the SDK's compaction AbortController. The returned release function is
 * idempotent and must stay held until the native compact() promise settles.
 */
export declare function tryAcquireSessionCompaction(session: object): (() => void) | undefined;
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