🔄 Rename method: classify_product_type → standalone_master_filter

- Rename classify_product_type() method to standalone_master_filter() for better clarity
- Update all 4 method calls within the same file
- Method functionality remains unchanged - still classifies product type and checks if it's a standalone master
- Improves code readability and method naming consistency

src/demand_filtering.py

@@ -85,7 +85,7 @@ class DemandFilter:
             print(f"Error loading data for filtering: {str(e)}")
             return False
     
-    def classify_product_type(self, product_id: str) -> Tuple[str, bool]:
+    def standalone_master_filter(self, product_id: str) -> Tuple[str, bool]:
         """
         Classify product type and check if it's a standalone master.
         
@@ -112,6 +112,9 @@ class DemandFilter:
     def is_product_ready_for_optimization(self, product_id: str) -> Tuple[bool, List[str]]:
         """
         Check if a product is ready for optimization.
+        1) Should be right type - standalone master, subkit, prepack
+        2) Should have line assignment
+        3) Should have staffing requirements
         
         Returns:
             Tuple[bool, List[str]]: (is_ready, exclusion_reasons)
@@ -119,7 +122,7 @@ class DemandFilter:
         exclusion_reasons = []
         
         # Classify product type
-        product_type, is_standalone_master = self.classify_product_type(product_id)
+        product_type, is_standalone_master = self.standalone_master_filter(product_id)
         
         # Check line assignment logic
         has_line_assignment = product_id in self.line_assignments
@@ -225,7 +228,7 @@ class DemandFilter:
             if included_without_speed > 0:
                 print(f"\n⚠️  DATA QUALITY WARNING: {included_without_speed} included products missing speed data (will use default 106.7 units/hour)")
         
-        included_without_hierarchy = sum(1 for pid in included_products if self.classify_product_type(pid)[0] == "unclassified")
+        included_without_hierarchy = sum(1 for pid in included_products if self.standalone_master_filter(pid)[0] == "unclassified")
         if included_without_hierarchy > 0:
             print(f"⚠️  DATA QUALITY WARNING: {included_without_hierarchy} included products missing hierarchy data")
         
@@ -257,7 +260,7 @@ class DemandFilter:
             print(f"Warning: Could not load speed data for analysis: {e}")
         
         for product_id, demand in all_products.items():
-            product_type, is_standalone_master = self.classify_product_type(product_id)
+            product_type, is_standalone_master = self.standalone_master_filter(product_id)
             is_ready, exclusion_reasons = self.is_product_ready_for_optimization(product_id)
             
             # Get staffing info