Add missing precipitation_percentage and intensity_levels to analysis

Fix KeyError by ensuring all expected fields are included in the
analyze_radar_pixels return dictionary.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

radar_analyzer.py

@@ -189,12 +189,18 @@ class CanadianRadarAnalyzer:
                     color_map[y, x] = match.rgb
                     pixel_stats[match.name] += 1
         
+        total_pixels = height * width
+        precipitation_pixels = sum(pixel_stats.values())
+        precipitation_percentage = (precipitation_pixels / total_pixels) * 100 if total_pixels > 0 else 0
+        
         return {
             'precipitation_map': precipitation_map,
             'color_map': color_map,
             'pixel_statistics': pixel_stats,
-            'total_pixels': height * width,
-            'precipitation_pixels': sum(pixel_stats.values())
+            'total_pixels': total_pixels,
+            'precipitation_pixels': precipitation_pixels,
+            'precipitation_percentage': precipitation_percentage,
+            'intensity_levels': pixel_stats
         }
     
     def find_color_regions(self, radar_image: np.ndarray, min_region_size: int = 100) -> List[Dict]: