KisaniCal/Analytics/AnalyticsEngine.swift

@@ -182,9 +182,13 @@ enum AnalyticsEngine {
         let sets      = days.reduce(0) { $0 + $1.sets }
         let volume    = days.reduce(0) { $0 + $1.volume }
         let duration  = days.reduce(0) { $0 + $1.durationMinutes }
+        func avg(_ vals: [Int]) -> Int? { vals.isEmpty ? nil : Int((Double(vals.reduce(0, +)) / Double(vals.count)).rounded()) }
         return PeriodSummary(sessions: sessions, sets: sets, volume: volume,
                              durationMinutes: duration, scheduled: scheduled,
-                             missed: missed, consistency: consistency(sessions: sessions, scheduled: scheduled))
+                             missed: missed, consistency: consistency(sessions: sessions, scheduled: scheduled),
+                             avgSteps: avg(days.compactMap { $0.steps }),
+                             avgActiveCalories: avg(days.compactMap { $0.activeCalories }),
+                             avgRestingHR: avg(days.compactMap { $0.restingHeartRate }))
     }
 
     private static func periodDeltas(current cur: PeriodSummary, previous prev: PeriodSummary) -> [String: MetricDelta] {

KisaniCal/Analytics/AnalyticsModels.swift

@@ -129,6 +129,10 @@ struct PeriodSummary: Codable, Equatable {
     let scheduled: Int
     let missed: Int
     let consistency: Double   // 0...1
+    // Available HealthKit trends — nil when no reference data in the period.
+    var avgSteps: Int? = nil
+    var avgActiveCalories: Int? = nil
+    var avgRestingHR: Int? = nil
 }
 
 /// Immutable weekly report. Once generated with `generatedAt`, later edits to

KisaniCal/Analytics/AnalyticsService.swift

@@ -33,6 +33,7 @@ final class AnalyticsService: ObservableObject {
         var workoutDates: Set<String> = []
         var scheduledWeekdays: Set<Int> = []
         var missedDates: Set<String> = []
+        var healthByDate: [String: RawHealthDay] = [:]   // HealthKit reference
 
         init() {}
         init(vm: WorkoutViewModel) {
@@ -43,13 +44,17 @@ final class AnalyticsService: ObservableObject {
         }
     }
 
+    /// Cached HealthKit per-day reference (refreshed async). Merged into snapshots.
+    private var healthByDate: [String: RawHealthDay] = [:]
+
     // MARK: - Reconcile (call on launch + scenePhase active)
 
     /// Snapshot recent days, backfill missing completed weekly/monthly reports,
     /// prune. Idempotent — safe to call every launch/foreground.
     @discardableResult
     func reconcile(using vm: WorkoutViewModel, now: Date = Date()) -> AnalyticsCoordinator.ReconcileResult {
-        let snap = WorkoutSnapshot(vm: vm)
+        var snap = WorkoutSnapshot(vm: vm)
+        snap.healthByDate = healthByDate
         snapshot = snap
         freezeRecentSnapshots(snap, now: now)
         let result = makeCoordinator(snap, now: now).reconcile()
@@ -57,6 +62,14 @@ final class AnalyticsService: ObservableObject {
         return result
     }
 
+    /// Refresh the HealthKit per-day reference cache (~13 months). Call from the
+    /// app's async Health sync path, then reconcile so new snapshots capture it.
+    func refreshHealthReference() async {
+        guard let start = calendar.date(byAdding: .month, value: -13, to: Date()) else { return }
+        let raw = await HealthKitManager.shared.dailyReference(from: start, to: Date())
+        healthByDate = raw.mapValues { RawHealthDay(steps: $0.steps, activeCalories: $0.calories, restingHeartRate: $0.restingHR) }
+    }
+
     private func makeCoordinator(_ snap: WorkoutSnapshot, now: Date) -> AnalyticsCoordinator {
         let cal = calendar
         return AnalyticsCoordinator(
@@ -100,7 +113,8 @@ final class AnalyticsService: ObservableObject {
                 workouts[key] = RawWorkoutDay(dateKey: key, didWorkout: true, sessions: 1, durationMinutes: 0, exercises: [])
             }
         }
-        return WorkoutAnalyticsAdapter.daySamples(dayKeys: keys, workouts: workouts, scheduledKeys: scheduled)
+        return WorkoutAnalyticsAdapter.daySamples(dayKeys: keys, workouts: workouts,
+                                                  scheduledKeys: scheduled, health: snap.healthByDate)
     }
 
     nonisolated private static func raw(from log: WorkoutDayLog, done: Bool) -> RawWorkoutDay {

KisaniCal/ContentView.swift

@@ -114,6 +114,8 @@ struct ContentView: View {
             Task {
                 await workoutVM.syncFromHealthKit()
                 NotificationManager.shared.reschedule(workoutVM: workoutVM, taskVM: taskVM)
+                await AnalyticsService.shared.refreshHealthReference()
+                AnalyticsService.shared.reconcile(using: workoutVM)
             }
         }
         .onChange(of: scenePhase) { phase in

KisaniCal/ISSUES.md

@@ -1645,3 +1645,32 @@ last. Device/build QA tracked here.
 - Self-review confirmed the singleton/actor pattern matches the app; remaining
   first-build risk is concentrated in `AnalyticsView.swift` (SwiftUI Charts /
   FlowRow generics) — surface-level, not logic.
+
+### KC-51 progress — Phase 4e: HealthKit historical reference wired (core-verified)
+- `HealthKitManager.dailyReference(from:to:)`: per-day steps/active-calories/
+  resting-HR over a range via 3 parallel `HKStatisticsCollectionQuery` (one
+  bucketed query per metric — efficient over a year, not per-day fetches).
+  Matches the file's existing `@MainActor` + continuation query pattern.
+- `AnalyticsService.refreshHealthReference()`: fetches ~13mo of reference,
+  caches it, merged into every `DaySample` built afterward. Called from the
+  existing Health-sync `Task` in `ContentView` (after `syncFromHealthKit`),
+  then reconciles so new/updated reports capture it.
+- `PeriodSummary` gained `avgSteps`/`avgActiveCalories`/`avgRestingHR` (nil when
+  no reference data in the period — honest, never fabricated). Weekly/monthly
+  cards in `AnalyticsView` show them when present.
+- **Verified standalone** (swiftc, 8/8): HK averages aggregate correctly when
+  present, stay nil when absent, workout metrics unaffected either way, reports
+  remain deterministic. Added `testSummarizeAggregatesHealthKitAveragesWhenPresent`
+  + `testSummarizeHealthKitNilWhenAbsent` to `AnalyticsEngineTests`.
+- This completes "available HealthKit trends" for weekly/monthly reports (goal
+  requirement). HealthKit remains the sole source for these values — nothing is
+  derived or estimated by the app.
+
+### KC-51 — status: all logic complete; awaiting first Xcode build (device, user-run)
+Every core + integration piece is now written: engine, store, adapter,
+coordinator, deep links, HealthKit reference, notifications, and a 6-area UI.
+Pure-Swift pieces (~110 assertions total) are compiler-verified standalone;
+SwiftUI/app-module pieces are self-reviewed but never compiled (no iOS runtime
+in this environment). User will build on device next. Awaiting: first-build
+error list (expected — SwiftUI Charts/generics are the likely spots), then
+XCTest run, then close out goal conditions #10/#11 and any remaining polish.

KisaniCal/Managers/HealthKitManager.swift

@@ -160,6 +160,51 @@ final class HealthKitManager: ObservableObject {
         }
     }
 
+    // MARK: - Historical daily reference (for analytics)
+
+    /// Per-day steps / active calories / resting heart rate over a range, keyed by
+    /// "yyyy-MM-dd". One bucketed statistics query per metric (efficient over a
+    /// year). HealthKit is the source of truth; values are read-only reference.
+    func dailyReference(from start: Date, to end: Date) async -> [String: (steps: Int?, calories: Int?, restingHR: Int?)] {
+        guard authorized, isAvailable else { return [:] }
+        let anchor = Calendar.current.startOfDay(for: start)
+        var interval = DateComponents(); interval.day = 1
+
+        async let steps = statsCollection(.stepCount, unit: .count(), options: .cumulativeSum, anchor: anchor, end: end, interval: interval)
+        async let cals  = statsCollection(.activeEnergyBurned, unit: .kilocalorie(), options: .cumulativeSum, anchor: anchor, end: end, interval: interval)
+        async let hr    = statsCollection(.restingHeartRate, unit: HKUnit(from: "count/min"), options: .discreteAverage, anchor: anchor, end: end, interval: interval)
+        let (s, c, h) = await (steps, cals, hr)
+
+        var out: [String: (steps: Int?, calories: Int?, restingHR: Int?)] = [:]
+        for key in Set(s.keys).union(c.keys).union(h.keys) {
+            out[key] = (s[key].map(Int.init), c[key].map(Int.init), h[key].map(Int.init))
+        }
+        return out
+    }
+
+    private func statsCollection(_ id: HKQuantityTypeIdentifier, unit: HKUnit, options: HKStatisticsOptions,
+                                 anchor: Date, end: Date, interval: DateComponents) async -> [String: Double] {
+        guard let type = HKQuantityType.quantityType(forIdentifier: id) else { return [:] }
+        return await withCheckedContinuation { cont in
+            let q = HKStatisticsCollectionQuery(quantityType: type, quantitySamplePredicate: nil,
+                                                options: options, anchorDate: anchor, intervalComponents: interval)
+            q.initialResultsHandler = { _, results, _ in
+                var dict: [String: Double] = [:]
+                let fmt = DateFormatter()
+                fmt.calendar = Calendar.current; fmt.timeZone = Calendar.current.timeZone
+                fmt.locale = Locale(identifier: "en_US_POSIX"); fmt.dateFormat = "yyyy-MM-dd"
+                results?.enumerateStatistics(from: anchor, to: end) { stat, _ in
+                    let quantity = options.contains(.cumulativeSum) ? stat.sumQuantity() : stat.averageQuantity()
+                    if let v = quantity?.doubleValue(for: unit), v > 0 {
+                        dict[fmt.string(from: stat.startDate)] = v
+                    }
+                }
+                cont.resume(returning: dict)
+            }
+            store.execute(q)
+        }
+    }
+
     // MARK: - Type sets
 
     private var readTypes: Set<HKObjectType> {

KisaniCal/Views/AnalyticsView.swift

@@ -192,6 +192,7 @@ struct AnalyticsView: View {
                 trendBadge(r.progression)
             }
             summaryRow(r.summary)
+            healthRow(r.summary)
             deltaChips(r.vsPreviousWeek)
         }
         .padding(14).cardBG(cs)
@@ -206,6 +207,7 @@ struct AnalyticsView: View {
                 trendBadge(r.classification)
             }
             summaryRow(r.summary)
+            healthRow(r.summary)
             deltaChips(r.vsPreviousMonth)
         }
         .padding(14).cardBG(cs)
@@ -221,6 +223,17 @@ struct AnalyticsView: View {
         }
     }
 
+    /// Available HealthKit trends for the period (shown only when present).
+    @ViewBuilder private func healthRow(_ s: PeriodSummary) -> some View {
+        if s.avgSteps != nil || s.avgActiveCalories != nil || s.avgRestingHR != nil {
+            HStack(spacing: 14) {
+                if let v = s.avgSteps { stat("\(v)", "avg steps") }
+                if let v = s.avgActiveCalories { stat("\(v)", "avg kcal") }
+                if let v = s.avgRestingHR { stat("\(v)", "avg bpm") }
+            }
+        }
+    }
+
     private func deltaChips(_ deltas: [String: MetricDelta]) -> some View {
         let order = ["volume", "sessions", "sets", "duration", "consistency"]
         return FlowRow(order.compactMap { key -> (String, MetricDelta)? in

KisaniCalTests/AnalyticsEngineTests.swift

@@ -170,6 +170,30 @@ final class AnalyticsEngineTests: XCTestCase {
         XCTAssertEqual(s.consistency, 2.0/3.0, accuracy: 0.0001)
     }
 
+    // MARK: - HealthKit reference aggregation (partial/missing data honest)
+
+    func testSummarizeAggregatesHealthKitAveragesWhenPresent() {
+        let days = [
+            DaySample(dateKey: "2026-07-06", didWorkout: true, scheduled: true, sessions: 1, sets: 20, volume: 1000,
+                      steps: 8000, activeCalories: 500, restingHeartRate: 55),
+            DaySample(dateKey: "2026-07-07", didWorkout: true, scheduled: true, sessions: 1, sets: 18, volume: 900,
+                      steps: 10000, activeCalories: 600, restingHeartRate: 57),
+            DaySample(dateKey: "2026-07-08", didWorkout: false, scheduled: false) // no HK reference
+        ]
+        let s = AnalyticsEngine.summarize(days)
+        XCTAssertEqual(s.avgSteps, 9000)
+        XCTAssertEqual(s.avgActiveCalories, 550)
+        XCTAssertEqual(s.avgRestingHR, 56)
+    }
+
+    func testSummarizeHealthKitNilWhenAbsent() {
+        let s = AnalyticsEngine.summarize([DaySample(dateKey: "2026-07-06", didWorkout: true, scheduled: true, sets: 20, volume: 1000)])
+        XCTAssertNil(s.avgSteps)
+        XCTAssertNil(s.avgActiveCalories)
+        XCTAssertNil(s.avgRestingHR)
+        XCTAssertEqual(s.volume, 1000)   // workout metrics unaffected
+    }
+
     // MARK: - Reports (idempotency / determinism)
 
     func testWeeklyReportDeterministic() {