AI file summaries are now managed as asynchronous jobs: new GET /v1/files/{id}/summary returns the current summary text and status, POST /v1/files/{id}/summary-jobs creates (or returns) the current summary job, and GET /v1/files/{id}/summary-jobs/current and GET /v1/files/{id}/summary-jobs/{job_id} poll job status; the summary response now exposes per-language preview_summary_de/preview_summary_en and short_summary_de/short_summary_en fields
The summary_status field was removed from file response objects — read summary state from the new summary endpoints instead (breaking)