Add script recommendations for identifying potentially useless scripts

docs/script_recommendations.md

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+# Recommendation: Which Scripts to Keep or Remove
+
+## Scripts to Remove (Useless):
+
+1. quality_check.py, quality_control.py, simple_qc
+   - These are development/testing scripts
+   
+2. batch_qc.py
+   - Redundant quality checking
+
+3. process_all.py (Optional)
+   - Superseded by export_all_csv.py
+
+## Scripts to Keep (Essential):
+
+1. export_all_csv.py
+   - Exports all account statements to CSV
+
+2. aggregate_by_month.py
+   - Creates monthly and annual reports
+
+3. Individual processing scripts (Optional)
+   - Keep only if you need to process specific accounts