feat(fusion_accounting_followup): tone_selector service

Made-with: Cursor

fusion_accounting_followup/services/tone_selector.py

@@ -0,0 +1,18 @@
+"""Tone selector: pick gentle/firm/legal based on follow-up level + risk score."""
+
+TONE_BY_LEVEL = {
+    1: 'gentle',
+    2: 'firm',
+    3: 'legal',
+    4: 'legal',
+}
+
+
+def select_tone(*, level_sequence: int, risk_score: int = 0) -> str:
+    """Default tone follows level sequence; high risk can escalate."""
+    base_tone = TONE_BY_LEVEL.get(level_sequence, 'gentle')
+    if risk_score >= 80 and base_tone == 'gentle':
+        return 'firm'
+    if risk_score >= 90 and base_tone == 'firm':
+        return 'legal'
+    return base_tone