/**
 * The selective .aidlc/cost/.gitignore (AC-15).
 *
 * Selective, NOT '*': .aidlc/cost/unattributed.ndjson is durable ledger
 * data that must remain trackable.
 *
 * The file lists itself, so it is never committed and exists only where
 * something wrote it. The cost-gitignore doctor migration writes it, and so
 * does every shim write: a fresh worktree gets a generated `capture.sh`
 * before doctor has ever run there, and without the ignore file a broad
 * `git add` commits the shim.
 */
export declare const COST_IGNORE_LINES: string[];
export declare function costIgnorePath(projectRoot: string): string;
/** Idempotently write the cost ignore lines. Returns the lines added. */
export declare function ensureCostGitignore(projectRoot: string): string[];
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