dartperf evidence

Updated 2026-10-22 Asia/Shanghai (Batch B G4 fill).

dt-list-add-empty–dt-growable-add-empty measured on Dart 3.13.6. Defaults unchanged.

See per-rule *.md + *.jsonl (or blocked stubs). Policy: ../docs/evidence-policy.md. Root matrix: ../../../docs/rule-regression.md.