feat: Complete Pattern 1 Lambda metering implementation

- Add Lambda metering to Pattern 1 Summarization function
- Track invocation counts and GB-seconds duration
- Complete Lambda execution cost tracking across ALL patterns

All core processing Lambda functions now have Lambda metering:
- Pattern 1: 1 function (Summarization)
- Pattern 2: 5 functions (OCR, Classification, Extraction, Assessment, Summarization)
- Pattern 3: 5 functions (OCR, Classification, Extraction, Assessment, Summarization)

Total: 11 Lambda functions with comprehensive cost tracking

Author: Bob Strahan

patterns/pattern-1/src/summarization_function/index.py

@@ -13,6 +13,7 @@
 from idp_common import get_config, summarization
 from idp_common.models import Document, Status
 from idp_common.docs_service import create_document_service
+from idp_common.utils import calculate_lambda_metering, merge_metering_data
 
 # Configuration will be loaded in handler function
 
@@ -76,6 +77,13 @@ def handler(event, context):
         else:
             logger.warning("Document summarization completed but no summary report URI was set")
 
+        # Add Lambda metering for successful summarization execution
+        try:
+            lambda_metering = calculate_lambda_metering("Summarization", context, start_time)
+            processed_document.metering = merge_metering_data(processed_document.metering, lambda_metering)
+        except Exception as e:
+            logger.warning(f"Failed to add Lambda metering for summarization: {str(e)}")
+        
         # Return the processed document using new serialization method
         return {
             'document': processed_document.serialize_document(working_bucket, "summarization", logger),