feat: SOTA baseline v2 with zh→en translation + companion-adapted prompts

- eval_sota_baselines_v2.py: optimized eval for WildGuard & ShieldGemma-2B
  * ChineseTranslator: Helsinki-NLP/opus-mt-zh-en (local, no API)
  * ShieldGemma: +4 companion-specific safety policies (crisis non-response,
    dependency reinforcement, isolation reinforcement, minor intimacy)
  * WildGuard: companion context injected into prompt + extended keyword parsing
  * Default threshold lowered 0.5 → 0.3 for better recall
  * Translation cache saved to experiments/translation_cache.json (reusable)
- tools/run_sota_v2.sh: one-command runner for both models on server
- paper/05_moduleB.tex: add †-adapted rows to SOTA table + updated discussion
  explaining root causes (language barrier + taxonomy gap) and adaptation results
- paper/07_experiments.tex: update baseline description to include v2 adapted variants

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tools/run_sota_v2.sh

@@ -0,0 +1,67 @@
+#!/bin/bash
+# Run optimized SOTA baseline evaluation (v2) on CompanionRisk-Bench.
+# Adaptations: zh→en translation + companion-specific prompts + threshold=0.3
+#
+# Usage:
+#   cd $PROJ && bash tools/run_sota_v2.sh
+#
+# Prerequisites on server:
+#   pip install sentencepiece sacremoses  # for Helsinki-NLP translation model
+
+set -e
+
+PROJ_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+cd "$PROJ_ROOT/code"
+
+PYTHON="/opt/conda/envs/dlapo-py310-cu128/bin/python"
+TEST_DATA="data/processed/CompanionRisk-Bench/test.jsonl"
+TRANSLATION_CACHE="../experiments/translation_cache.json"
+
+WILDGUARD_PATH="../wildguard"
+SHIELDGEMMA_PATH="/root/siton-data-2849d4ce327c4ccfb233ce33868fe7fe/zsy/shieldgemma-2b"
+
+echo "=============================================="
+echo " SOTA Baseline v2 — WildGuard + ShieldGemma"
+echo " zh→en translation ON | threshold=0.3"
+echo "=============================================="
+
+# ── Install translation dependencies (one-time) ──
+echo ""
+echo "[0] Checking translation dependencies..."
+$PYTHON -c "import sentencepiece" 2>/dev/null || \
+    pip install sentencepiece sacremoses --quiet
+
+# ── WildGuard v2 ──
+echo ""
+echo "[1/2] Evaluating WildGuard v2 (translate + companion prompt)..."
+$PYTHON scripts/eval_sota_baselines_v2.py \
+    --model wildguard \
+    --model-path "$WILDGUARD_PATH" \
+    --test-data "$TEST_DATA" \
+    --output "../experiments/eval_sota_wildguard_v2.json" \
+    --translate \
+    --translation-cache "$TRANSLATION_CACHE" \
+    --translate-device cuda \
+    --threshold 0.3 \
+    --device cuda
+
+# ── ShieldGemma-2B v2 ──
+echo ""
+echo "[2/2] Evaluating ShieldGemma-2B v2 (translate + companion policies)..."
+$PYTHON scripts/eval_sota_baselines_v2.py \
+    --model shieldgemma2b \
+    --model-path "$SHIELDGEMMA_PATH" \
+    --test-data "$TEST_DATA" \
+    --output "../experiments/eval_sota_shieldgemma2b_v2.json" \
+    --translate \
+    --translation-cache "$TRANSLATION_CACHE" \
+    --translate-device cuda \
+    --threshold 0.3 \
+    --device cuda
+
+echo ""
+echo "=============================================="
+echo " Done. Results:"
+echo "   experiments/eval_sota_wildguard_v2.json"
+echo "   experiments/eval_sota_shieldgemma2b_v2.json"
+echo "=============================================="