/**
 * Shared helper for nested selective .gitignore migrations (AC-15, AC-16).
 *
 * Ignore rules live in a .gitignore INSIDE the governed directory (the
 * traceability/cache.ts self-ignoring pattern) — the project root
 * .gitignore is never modified. Lines are SELECTIVE, not '*': directories
 * like .aidlc/cost/ mix ephemera with files that must remain trackable
 * (unattributed.ndjson). Do not simplify to '*'.
 */
/** Lines from `ignorePath` missing the required entries (empty = healthy). */
export declare function missingIgnoreLines(ignorePath: string, required: string[]): string[];
/** Idempotently ensure `required` lines exist in `ignorePath`. Returns lines added. */
export declare function ensureIgnoreLines(ignorePath: string, required: string[]): string[];
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