fix(hud): simplify kill tracking - only count non-Shrapnel loot

- Shrapnel-only mobs undercounted, but no overcounting
- Better to undercount than overcount for profit analysis
- Removes complex Shrapnel heuristic

ui/main_window.py

@@ -890,9 +890,6 @@ class MainWindow(QMainWindow):
         self.set_session_state(SessionState.RUNNING)
         self.current_session_id = project_id
         
-        # Reset shrapnel counter for kill tracking
-        self._shrapnel_count = 0
-        
         # Emit signal
         self.session_started.emit(project_id)
         
@@ -961,24 +958,10 @@ class MainWindow(QMainWindow):
             if item_name == 'Universal Ammo':
                 return
             
-            # Kill tracking heuristic:
-            # - Non-Shrapnel loot = definite kill (reset Shrapnel counter)
-            # - Shrapnel: count as kill every 2 Shrapnel
+            # Kill tracking: Only count on non-Shrapnel loot
+            # Shrapnel-only mobs will be undercounted, but avoids overcounting
             if item_name != 'Shrapnel':
-                # Real loot = 1 kill, and reset Shrapnel counter
-                # (The Shrapnel we collected belongs to this kill)
                 self.hud.update_stats({'kills_add': 1})
-                self._shrapnel_count = 0
-            else:
-                # Track Shrapnel count for this session
-                if not hasattr(self, '_shrapnel_count'):
-                    self._shrapnel_count = 0
-                self._shrapnel_count += quantity
-                # Every 2 Shrapnel = 1 kill (approximate)
-                kills_from_shrapnel = self._shrapnel_count // 2
-                if kills_from_shrapnel > 0:
-                    self.hud.update_stats({'kills_add': kills_from_shrapnel})
-                    self._shrapnel_count -= kills_from_shrapnel * 2
             
             # Queue database write for main thread (SQLite thread safety)
             if self._current_db_session_id: