Require 'up to X% discount' phrasing in all LLM outputs

Add critical rule to eligibility explanation prompts (all confidence
tiers, both EN/ES) and follow-up chat system prompt to always say
"up to a X% discount", never "a X% discount" directly.

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

app.py

@@ -364,17 +364,20 @@ def generate_explanation_streaming(data):
             lang_guide = """LENGUAJE DEFINITIVO - Este es un derecho estatutario:
 - Usa "califica" o "es elegible" con confianza
 - Enfatiza que es una ley estatal (PA 24-81)
-- No uses "puede" - esto es definitivo"""
+- No uses "puede" - esto es definitivo
+- IMPORTANTE: Siempre di "hasta un X% de descuento", nunca "un X% de descuento" directamente"""
         elif confidence == "strong":
             lang_guide = """LENGUAJE CONFIADO:
 - Usa "parece ser elegible" o "aparentemente califica"
 - Sé positivo pero incluye "basado en la información proporcionada"
-- Anima a confirmar con el hospital"""
+- Anima a confirmar con el hospital
+- IMPORTANTE: Siempre di "hasta un X% de descuento", nunca "un X% de descuento" directamente"""
         elif confidence == "moderate":
             lang_guide = """LENGUAJE CAUTELOSO:
 - Usa "puede calificar" o "podría ser elegible"
 - IMPORTANTE: Menciona los requisitos adicionales (límites de activos, etc.)
-- Enfatiza la necesidad de contactar al hospital"""
+- Enfatiza la necesidad de contactar al hospital
+- IMPORTANTE: Siempre di "hasta un X% de descuento", nunca "un X% de descuento" directamente"""
         else:
             lang_guide = """LENGUAJE AMABLE PERO DIRECTO:
 - Sé claro: "sus ingresos superan los umbrales"
@@ -385,23 +388,28 @@ def generate_explanation_streaming(data):
 
 {lang_guide}
 
+REGLA CRÍTICA: Cuando menciones descuentos, SIEMPRE usa "hasta" — por ejemplo "hasta un 100% de descuento", NUNCA "un 100% de descuento".
+
 Explica en 2 párrafos claros y cálidos. Máximo 150 palabras."""
     else:
         if confidence == "statutory":
             lang_guide = """DEFINITIVE LANGUAGE - This is a statutory right:
 - Use "you qualify" or "you are eligible" confidently
 - Emphasize this is Connecticut state law (PA 24-81)
-- Don't use "may" - this is definitive"""
+- Don't use "may" - this is definitive
+- IMPORTANT: Always say "up to a X% discount", NEVER "a X% discount" directly"""
         elif confidence == "strong":
             lang_guide = """CONFIDENT LANGUAGE:
 - Use "you appear to be eligible" or "you likely qualify"
 - Be positive but include "based on the information provided"
-- Encourage hospital confirmation"""
+- Encourage hospital confirmation
+- IMPORTANT: Always say "up to a X% discount", NEVER "a X% discount" directly"""
         elif confidence == "moderate":
             lang_guide = """CAUTIOUS LANGUAGE:
 - Use "you may qualify" or "you could be eligible"
 - IMPORTANT: Mention additional requirements (asset limits, etc.)
-- Emphasize need to contact hospital"""
+- Emphasize need to contact hospital
+- IMPORTANT: Always say "up to a X% discount", NEVER "a X% discount" directly"""
         else:
             lang_guide = """GENTLE BUT DIRECT LANGUAGE:
 - Be clear: "your income exceeds the eligibility thresholds"
@@ -412,6 +420,8 @@ Explica en 2 párrafos claros y cálidos. Máximo 150 palabras."""
 
 {lang_guide}
 
+CRITICAL RULE: When mentioning discounts, ALWAYS use "up to" — e.g. "up to a 100% discount", NEVER "a 100% discount". This applies to all discount percentages.
+
 Explain in 2 clear, warm paragraphs. Maximum 150 words."""
 
     insurance_note = ""
@@ -556,6 +566,8 @@ CHAT_SYSTEM_PROMPT = (
     "topics under Connecticut Public Act 24-81. If asked about anything unrelated, politely "
     "redirect: 'I can only help with questions about Connecticut hospital financial assistance. "
     "For other questions, please contact the Office of the Healthcare Advocate at portal.ct.gov/oha.' "
+    "CRITICAL RULE: When mentioning discounts, ALWAYS say 'up to' — e.g. 'up to a 100% discount', "
+    "NEVER 'a 100% discount'. This applies to all discount percentages. "
     "Keep answers concise — 2-3 paragraphs maximum. Be warm and supportive."
 )