Submits a batch of records for segmentation and blocks until results are available. Returns 200 OK with per-record segment assignments inline.

Unknown configIds are ignored: a well-formed id that does not match an existing segment config is skipped rather than failing the run. Returns 400 if configIds or records are missing/empty, exceed their limits (10 configs, 25 records), if a configId is malformed (not a valid integer id), or if none of the supplied configIds match an existing config. Returns 5xx if the run errors before any record can be segmented; partial errors are reported per-record in the response.