Pass raw health metrics to AI instead of hardcoded correlations

- Replace HealthService.analyzeCorrelations() with computeHealthAverages()
- Remove hardcoded threshold-based correlation analysis (8k steps, 7hrs sleep, etc.)
- Pass raw averages (steps, exercise, sleep, HRV, HR, mindfulness, calories) to AI
- Let Apple Intelligence find nuanced multi-variable patterns naturally
- Update MoodDataSummarizer to format raw health data for AI prompts
- Simplifies code by ~200 lines while improving insight quality

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Shared/HealthKitManager.swift

@@ -30,11 +30,26 @@ class HealthKitManager: ObservableObject {
     }
 
     // Health data types for insights (read-only)
+    // Core activity metrics
     private let stepCountType = HKQuantityType.quantityType(forIdentifier: .stepCount)!
     private let exerciseTimeType = HKQuantityType.quantityType(forIdentifier: .appleExerciseTime)!
+    private let activeEnergyType = HKQuantityType.quantityType(forIdentifier: .activeEnergyBurned)!
+    private let distanceType = HKQuantityType.quantityType(forIdentifier: .distanceWalkingRunning)!
+
+    // Heart & stress indicators
     private let heartRateType = HKQuantityType.quantityType(forIdentifier: .heartRate)!
+    private let restingHeartRateType = HKQuantityType.quantityType(forIdentifier: .restingHeartRate)!
+    private let hrvType = HKQuantityType.quantityType(forIdentifier: .heartRateVariabilitySDNN)!
+
+    // Sleep & recovery
     private let sleepAnalysisType = HKCategoryType.categoryType(forIdentifier: .sleepAnalysis)!
 
+    // Mindfulness
+    private let mindfulSessionType = HKCategoryType.categoryType(forIdentifier: .mindfulSession)!
+
+    // Workouts
+    private let workoutType = HKWorkoutType.workoutType()
+
     // MARK: - Authorization
 
     var isHealthKitAvailable: Bool {
@@ -55,16 +70,32 @@ class HealthKitManager: ObservableObject {
         // Write permission for State of Mind
         let typesToShare: Set<HKSampleType> = [stateOfMindType]
 
-        // Read permissions for insights + State of Mind
+        // Read permissions for mood-health correlation insights
+        // These help Apple's AI provide personalized health insights
         let typesToRead: Set<HKObjectType> = [
+            // State of Mind (read back our own data)
             stateOfMindType,
+
+            // Activity - correlates with mood and energy levels
             stepCountType,
             exerciseTimeType,
+            activeEnergyType,
+            distanceType,
+            workoutType,
+
+            // Heart metrics - stress and recovery indicators
             heartRateType,
-            sleepAnalysisType
+            restingHeartRateType,
+            hrvType,
+
+            // Sleep - strong correlation with mood
+            sleepAnalysisType,
+
+            // Mindfulness - meditation impact on mood
+            mindfulSessionType
         ]
 
-        logger.info("Requesting HealthKit permissions: share=1, read=5")
+        logger.info("Requesting HealthKit permissions: share=1, read=\(typesToRead.count)")
 
         try await healthStore.requestAuthorization(toShare: typesToShare, read: typesToRead)