/** The canonical marker. Written by every path from now on. */
export declare const ENGRAM_HOOK_MARKER = "Engram Post-Commit Hook";
/** True if this post-commit hook contains a block Engram wrote, by any path,
 *  in any version. */
export declare function isEngramHook(content: string): boolean;
/**
 * Remove Engram's block and leave everything else intact.
 *
 * Deleting the whole file is only safe when Engram wrote the whole file, which
 * is exactly what the caller must decide from the result — a co-resident hook
 * must survive. Returns the content with Engram's lines removed; the caller
 * deletes the file only if what remains is nothing but a shebang.
 */
export declare function stripEngramHookBlock(content: string): string;
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