Key Decision: Minimal Goal System BEFORE Placeholders
Critical Finding:
- Same data = different interpretation per goal
- Example: -5kg FM, -2kg LBM
- weight_loss: 78/100 (good!)
- strength: 32/100 (LBM loss critical!)
- Without goal: 50/100 (generic, wrong for both)
Recommended Approach (Hybrid):
1. Phase 0a (2-3h): Minimal Goal System
- DB: goal_mode field
- API: Get/Set Goal
- UI: Goal Selector
- Default: health
2. Phase 0b (16-20h): Goal-Aware Placeholders
- 84 placeholders with goal-dependent calculations
- Scores use goal_mode from day 1
- No rework needed later
3. Phase 2+ (6-8h): Full Goal System
- Goal recognition from patterns
- Secondary goals
- Goal progression tracking
Why Hybrid Works:
✅ Charts show correct interpretations immediately
✅ No rework of 84 placeholders later
✅ Goal recognition can come later (needs placeholders anyway)
✅ System is "smart coach" from day 1
File: docs/GOAL_SYSTEM_PRIORITY_ANALYSIS.md (650 lines)
