Health backfill

import ai.synheart.core.backfill.HealthConnectRuntimeSink
import ai.synheart.wear.adapters.HealthConnectAdapter

// The HealthHistoryReader contract lives in synheart-wear-kotlin;
// HealthConnectAdapter implements it.
val reader = HealthConnectAdapter(context)
val sink = HealthConnectRuntimeSink(
    reader = reader,
    bridge = coreRuntime,
)

// Call after the user has granted Health Connect read permissions
// (and ConsentType.BIOSIGNALS on the Synheart side). Heavy — first
// run can take 10+ seconds for a year of HR samples on cold cache.
val result = sink.backfill(daysBack = 365)
println("seeded ${result.daysIngested} days, ${result.dimensionsPushed} dimensions in ${result.durationMs}ms")

import SynheartCore
import SynheartWear

// HealthKitHistoryReader implements HealthHistoryReader; owns its own HKHealthStore.
let reader = HealthKitHistoryReader()
let sink = HealthKitRuntimeSink(
    reader: reader,
    pushDaily: { dimension, dayIndex, value, confidence, fidelity in
        coreRuntime.pushWearableDailyValue(
            dimension: dimension,
            dayIndex: dayIndex,
            value: value,
            confidence: confidence,
            fidelity: fidelity
        )
    },
    triggerRecompute: {
        coreRuntime.triggerWearableRecompute(triggerType: 0, asOfDay: 0)
    }
)

// Call after HealthKit authorization + ConsentType.biosignals granted.
let result = try await sink.backfill(daysBack: 365)
print("seeded \(result.daysIngested) days, \(result.dimensionsPushed) dims in \(result.durationMs)ms")

fetchSleepNights(start, end, zone) → Map<LocalDate, SleepNightSummary>
fetchOvernightPhysiology(start, end, zone) → Map<LocalDate, OvernightPhysiologySummary>