Stream evaluations as CSV or JSONL (sync export)

Cursor-streamed synchronous export of evaluations. Rows are written directly to the response body — never buffered — and capped per plan (Starter: 100, Pro/Team/Business: 5000, Enterprise: unlimited).

CSV columns (in order): id, trace_id, metric, score, label, evaluator_type, model_tier, created_at.

Reasoning is omitted by default. Pass include_reasoning=true to include a reasoning column/field truncated to 500 characters.