English blocklists missed injections in Vietnamese/Japanese. Added 5 VI/JA
block-patterns to prompt-filter.yaml (data-driven — loaded into the blocklist,
matched on raw UTF-8 via match_either), anchored on the injection OBJECT
(chỉ dẫn/quy tắc/hệ thống/prompt · 指示/命令/ルール/システムプロンプト) so benign
VI/JA text is not caught. No code change to security-check.sh.
- phase-h4-multilingual-tests.sh: 7 checks — VI×3 + JA×2 injections BLOCK; 63
benign VI/JA corpus samples → 0 false positives; the trap line "bỏ qua các
bước" (skip steps) correctly allowed.
- redteam-vectors.jsonl: +4 VI/JA vectors (feeds benign-fp-report block-rate).
Baselines: run-casan4 35/35, adversarial 44/44. Lifts H4 gap "multilingual VI/JA".
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
