Deterministic (seeded), in the app's own event model rather than a real
transcript: 3,601 events split into a 3,200-event opening backlog and a
400-event tail both bench harnesses replay as the streaming phase, with
headings, inline markdown, fenced code in six languages, a table, tool
calls with kilobyte-scale input/output, and two embedded PNGs.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
