fix: enforce strict JSON output in LLM prompts

src/curaflow_agent/activities.py

@@ -29,6 +29,7 @@ async def structure_note_activity(raw_dictation: str) -> dict:
     
     prompt = PromptTemplate.from_template(
         "You are an expert AI Medical Scribe. Extract the clinical information from the following raw dictation and structure it perfectly.\n\n"
+        "IMPORTANT: You must output ONLY RAW VALID JSON. Do not include any conversational text, explanations, or formatting like '```json'. Start immediately with '{{' and end with '}}'.\n\n"
         "Dictation:\n{dictation}\n"
     )
     
@@ -52,6 +53,7 @@ async def generate_billing_codes_activity(clinical_note_dict: dict) -> dict:
     prompt = PromptTemplate.from_template(
         "You are an expert Medical Coder. Review the following structured clinical note and identify all applicable ICD-10 diagnosis codes and CPT procedure codes.\n"
         "Provide a clear justification for each code based solely on the provided clinical note.\n\n"
+        "IMPORTANT: You must output ONLY RAW VALID JSON. Do not include any conversational text, explanations, or markdown formatting like '```json'. Start immediately with '{{' and end with '}}'.\n\n"
         "Clinical Note:\n{note}\n"
     )
     
@@ -75,6 +77,7 @@ async def analyze_lab_anomaly_activity(input_data: dict) -> dict:
     prompt = PromptTemplate.from_template(
         "You are an expert AI Medical Diagnostic Assistant.\n"
         "Review the following patient data and the new lab result. Determine if there is a dangerous anomaly or correlation (e.g., a lab result that is dangerous given the patient's current medications or baseline).\n\n"
+        "IMPORTANT: You must output ONLY RAW VALID JSON. Do not include any conversational text, explanations, or formatting like '```json'. Start immediately with '{{' and end with '}}'.\n\n"
         "Baseline Conditions: {baseline}\n"
         "Current Medications: {medications}\n"
         "New Lab Result: {new_lab_result}\n\n"