method GitOperations.prototype.getMergeCommits GitOperations.prototype.getMergeCommits(since: string): Promise<Array<{ sha: string; message: string; date: string; }>> Get merge commits since a specific tag or commit Used for PR detection in changelog generation Parameters since: string Git ref to start from (tag, commit hash, etc.) Return Type Promise<Array<{ sha: string; message: string; date: string; }>> Array of merge commits with PR information