/**
 * Discovers every `.env*` file in a directory for matrix comparison.
 *
 * Unlike `discoverEnvFiles`, this intentionally includes `.env.example*`
 * variants, since matrix mode treats every file as an equal column rather
 * than pairing an env file with a reference example file.
 *
 * @param cwd - The directory to search.
 * @returns File names matching `.env*`, sorted with `.env` first, then alphabetically.
 */
export declare function discoverMatrixFiles(cwd: string): string[];
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