/**
 * shared/gitignore — auto-manage .pi/.gitignore entries for pi-swarm state.
 *
 * Ensures `swarm/state/` is listed in `.pi/.gitignore` so durable
 * runtime state is never committed. Only operates when the project is an
 * actual git repository (#110) and only writes to `.pi/.gitignore`
 * (#123) — never the project-root `.gitignore`, which would be an
 * unwanted side effect in projects that opt out of gitignore.
 */
/**
 * Ensure `swarm/state/` (relative to `.pi/`) is listed in `.pi/.gitignore`.
 *
 * Behavior (#123):
 *   - If cwd is not a git repository: do nothing (#110).
 *   - If `.pi/.gitignore` exists and contains the entry: no-op.
 *   - If `.pi/.gitignore` exists but lacks the entry: append it.
 *   - If `.pi/.gitignore` does not exist: create it inside `.pi/`.
 *
 * Never writes to the project-root `.gitignore`. Every filesystem
 * error is surfaced via `console.error` (AGENTS.md §0 Quality Gates).
 */
export declare function ensureGitignore(cwd: string): void;
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