Text log

-log is truncated when Batch starts. JSON-RPC workflow events are rendered as event, phase, percentage, and detail lines. Captured child stdout/stderr is appended, and successful completion records study/dataset/save counts. Load, workflow, timeout, and persistence failures append ERROR lines. Argument parsing, unsafe log-path relationships, and license initialization can fail before a log record; stderr and the stable exit category remain authoritative in those cases.