feat: Phase 0c - migrate activity_metrics calculations to data_layer (20 functions)
- Migrated all 20 calculation functions from calculations/activity_metrics.py to data_layer/activity_metrics.py
- Functions: Training volume (minutes/week, frequency, quality sessions %)
- Functions: Intensity distribution (proxy-based until HR zones available)
- Functions: Ability balance (strength, endurance, mental, coordination, mobility)
- Functions: Load monitoring (internal load proxy, monotony score, strain score)
- Functions: Activity scoring (main score with focus weights, strength/cardio/balance helpers)
- Functions: Rest day compliance
- Functions: VO2max trend (28d)
- Functions: Data quality assessment
- Updated data_layer/__init__.py with 17 new exports
- Refactored placeholder_resolver.py to import activity_metrics from data_layer
Module 3/6 complete. Single Source of Truth for activity metrics established.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Lars
dc34d3d2f2