Fix currency symbol display in AI explainer for different countries

- Add country-specific currency symbols (£ for UK, $ for US/CA, ₪ for IL, ₦ for NG)
- Move prompt template to a method that selects appropriate currency based on country_id
- Fixes issue where UK explanations incorrectly displayed $ instead of £

🤖 Generated with Claude Code

Co-Authored-By: Claude <[email protected]>

Author: MaxGhenis

policyengine_api/services/tracer_analysis_service.py

@@ -51,8 +51,11 @@ def execute_analysis(
             print(f"Error parsing tracer output: {str(e)}")
             raise e
 
+        # Get the appropriate prompt template based on country
+        prompt_template = self._get_prompt_template(country_id)
+        
         # Add the parsed tracer output to the prompt
-        prompt = self.prompt_template.format(
+        prompt = prompt_template.format(
             variable=variable, tracer_segment=tracer_segment
         )
 
@@ -135,7 +138,24 @@ def _parse_tracer_output(self, tracer_output, target_variable):
 
         return result
 
-    prompt_template = f"""{anthropic.HUMAN_PROMPT} You are an AI assistant explaining policy calculations. 
+    def _get_prompt_template(self, country_id: str) -> str:
+        """Get the appropriate prompt template with correct currency symbol based on country."""
+        
+        # Determine currency instruction based on country
+        currency_instructions = {
+            "uk": "The response will be rendered as markdown, so preface £ with \\.",
+            "us": "The response will be rendered as markdown, so preface $ with \\.",
+            "ca": "The response will be rendered as markdown, so preface $ with \\.",
+            "il": "The response will be rendered as markdown, so preface ₪ with \\.",
+            "ng": "The response will be rendered as markdown, so preface ₦ with \\.",
+        }
+        
+        currency_note = currency_instructions.get(
+            country_id, 
+            "The response will be rendered as markdown."
+        )
+        
+        return f"""{anthropic.HUMAN_PROMPT} You are an AI assistant explaining policy calculations. 
   The user has run a simulation for the variable '{{variable}}'.
   Here's the tracer output:
   {{tracer_segment}}
@@ -146,4 +166,4 @@ def _parse_tracer_output(self, tracer_output, target_variable):
   3. Mention any key thresholds or rules that affected the calculation.
   4. If relevant, suggest how changes in input might affect this result.
       
-  Provide only factual explanations of the policy mechanics. Do not include commentary, opinions, quotes, or phrases like "Certainly!" or "Here's an explanation." The response will be rendered as markdown, so preface $ with \\."""
+  Provide only factual explanations of the policy mechanics. Do not include commentary, opinions, quotes, or phrases like "Certainly!" or "Here's an explanation." {currency_note}"""