/**
 * Decompress one checksummed Zstandard session log through the system `zstd`
 * CLI (task 0067 R5 — sanctioned process seam, ADR-014). A missing executable
 * or a decompression failure raises an actionable HistoryImportError naming
 * zstd and the file — never a bare spawn failure.
 *
 * ponytail: buffered decompression; swap to `ProcessExecutor.runStreaming`
 * (`zstd -dc <file>` stdout piping) if live sessions regularly exceed ~100 MB
 * decompressed.
 */
export declare function zstdDecompress(file: string, env?: Record<string, string>): Promise<string>;
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