feat: add demo videos for iOS, Watch, and website - #4
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Evolve StressEngine from a single HR-primary formula to a context-aware engine with explicit mode detection, branch-specific scoring, disagreement damping, and confidence output. Engine changes (StressEngine.swift): - Add StressMode detection (acute/desk/unknown) from steps, workout, sedentary signals - Acute branch: preserves existing HR-primary weights (RHR 50%, HRV 30%, CV 20%) - Desk branch: HRV-primary weights (RHR 10%, HRV 55%, CV 35%) for seated contexts - Unknown mode: blended weights compressed toward neutral - Disagreement damping: when RHR and HRV contradict, compress score toward neutral - New computeStress(context:) entry point using StressContextInput - Backward-compatible: existing computeStress() APIs unchanged Model changes (HeartModels.swift): - Add StressMode enum (acute/desk/unknown) - Add StressConfidence enum (high/moderate/low) with numeric weights - Add StressSignalBreakdown for per-signal explainability - Add StressContextInput struct with activity and lifestyle context - Extend StressResult with mode, confidence, signalBreakdown, warnings Integration changes: - DashboardViewModel: passes stress confidence to ReadinessEngine - StressViewModel: uses context-aware computeStress(snapshot:recentHistory:) - StressView: shows confidence badge and signal quality warnings - ReadinessEngine: attenuates stress pillar by confidence (low confidence = less impact) All 629 tests pass.
… improvement docs - Add deskBranch and deskBranchDamped to StressDiagnosticVariant enum - Implement desk-branch scoring logic (RHR 10%, HRV 55%, CV 35%) in diagnosticStressScore() - Add FP/FN export summaries to SWELL, PhysioNet, and WESAD dataset tests - Add StressModeAndConfidenceTests with 13 tests for mode detection and confidence calibration - Add STRESS_ENGINE_IMPROVEMENT_LOG documenting all changes and validation results - Add time-series fixture results for BioAge, BuddyRecommendation, and Coaching engines
CRITICAL: - Replace Timer with cancellable Task in StressViewModel breathing session to eliminate RunLoop retain cycle - Surface HealthKit fetch errors on device instead of silently falling back to empty data that produces wrong assessments - LocalStore already encrypts all data via CryptoService (verified) HIGH: - Fix force unwrap on Calendar.date(byAdding:) in SettingsView - Consolidate two divergent stress computation paths — StressViewModel now uses computeStress(snapshot:recentHistory:) matching Dashboard, which also fixes HRV defaulting to 0 instead of nil - Log subscription verification errors instead of try? swallowing them MEDIUM: - Fix Watch feedback race by restoring local state before Combine subs - Extract 9 DateFormatters to static let across 4 view files - Remove unused hasBoundDependencies flag from DashboardView - ReadinessEngine already handles nil consecutiveAlert safely Also includes prior session work: - HealthKit history caching across range switches - Regression test suite (CodeReviewRegressionTests) - DashboardView decomposed into 6 extension files (2199→630 lines) - MASTER_SYSTEM_DESIGN.md gap items and line counts updated
…validation improvements - Refine desk-branch weights (RHR 0.20, HRV 0.50, CV 0.30) for better cognitive load detection - Add bidirectional HRV z-score in desk mode (any deviation from baseline = cognitive load) - Expose mode parameter on computeStress public API for dataset validation - Switch SWELL and WESAD validation to desk mode (seated/cognitive datasets) - Add raw signal diagnostics to WESAD test for debugging - Enable DatasetValidationTests in project.yml (previously excluded) - Pass actual stress score and confidence to ReadinessEngine in StressViewModel - Add CorrelationEngine time-series fixtures for all 20 personas - Update BuddyRecommendation and NudgeGenerator fixtures for engine changes
- PROJECT_CODE_REVIEW_2026-03-13: Full review of stress engine, zone engine, and correlation engine changes with risk assessment and recommendations - PROJECT_UPDATE_2026_03_13: Sprint summary with epic stories, subtasks, bug updates, test results, validation confidence, and file manifest
- BUG-056: LocalStore assertionFailure crash in simulator (P2, open) - BUG-057: Swift compiler Signal 11 with nested structs (P3, workaround) - BUG-058: Synthetic persona scores outside ranges (P3, known) - Updated tracking summary: 58 total, 54 fixed, 3 open, 1 workaround
Regenerated 420 fixture JSON files across 4 engines (BioAgeEngine 140, BuddyRecommendationEngine 100, CoachingEngine 80, CorrelationEngine 100). 16 BuddyRecommendation fixtures updated due to stress engine weight changes. All time-series KPIs passing: - BioAgeEngine: 145/145 - BuddyRecommendationEngine: 100/100 - CoachingEngine: 80/80 - CorrelationEngine: 205/206 (1 weak-correlation direction check)
# Conflicts: # apps/HeartCoach/iOS/ViewModels/StressViewModel.swift
- Build animated HTML mockups with CSS keyframes for all 3 platforms - iOS demo: 6 screens (Dashboard, Stress, Insights, Trends, Nudge, Features) - Watch demo: 4 screens (Score, Insight Flow, Nudge, Complication) - Website demo: 3 sections (Hero, Features, Device Showcase) - Record via Playwright, convert to MP4 with ffmpeg - Embed video links in README Demo section
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Summary
Files
apps/HeartCoach/web/demos/ios-demo.html+.mp4(419K)apps/HeartCoach/web/demos/watch-demo.html+.mp4(181K)apps/HeartCoach/web/demos/website-demo.html+.mp4(2.5M)README.md— added Demo sectionTest plan