Update prompt template to show chain of thought (default)

- catllm uses chain_of_thought=True by default
- Updated methodology report to show the actual step-by-step prompt

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

app.py

@@ -526,11 +526,16 @@ def classify_data(spreadsheet_file, spreadsheet_column,
         else:
             success_rate = 100.0
 
-        # Build prompt template for documentation
-        prompt_template = '''Categorize this survey response "{response}" into the following categories:
+        # Build prompt template for documentation (chain of thought - default)
+        prompt_template = '''Categorize this survey response "{response}" into the following categories that apply:
 {categories}
-Provide your work in JSON format where the number belonging to each category
-is the key and a 1 if the category is present and a 0 if not.'''
+
+Let's think step by step:
+1. First, identify the main themes mentioned in the response
+2. Then, match each theme to the relevant categories
+3. Finally, assign 1 to matching categories and 0 to non-matching categories
+
+Provide your work in JSON format where the number belonging to each category is the key and a 1 if the category is present and a 0 if it is not present as key values.'''
 
         # Get version info
         try: