Per-benchmark Excel: each <bench>/<bench>.xlsx (4 sheets) alongside report.jsonl

Co-Authored-By: Claude <noreply@anthropic.com>

evalharness/cli.py

@@ -690,6 +690,14 @@ def _cmd_eval_run(args) -> int:
                 bench_dir = _P(out_dir) / name
                 bench_dir.mkdir(parents=True, exist_ok=True)
                 report.save(str(bench_dir / 'report.jsonl'))
+                # per-benchmark Excel (Summary/Perf/Categories/Samples sheets)
+                try:
+                    from evalharness.viz import render as _r2
+
+                    _r2([report], style='excel',
+                        out=str(bench_dir / f'{name}.xlsx'))
+                except Exception:
+                    pass  # excel is a nice-to-have, never block the run
             if args.verbose:
                 if not _print_result_panel(console, report, _time.time() - t0):
                     print(render(report, style=args.style))