feat: document future scope including FHIR integration, wearable sync, and other planned features.

PROJECT_MGMT/future_scope.md

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+# Future Scope
+
+Features planned for later phases, beyond the initial MVP.
+
+---
+
+## FHIR Integration (Phase 5+)
+
+**FHIR** (Fast Healthcare Interoperability Resources) is an industry standard for health data exchange.
+
+### Use Cases
+- Export biomarker data to hospital EHR systems
+- Share standardized health records with doctors
+- Generate CCD (Continuity of Care Documents)
+
+### Rust Options
+| Crate | Notes |
+|-------|-------|
+| `fhir-sdk` | Async-friendly, feature-rich |
+| `fhirbolt` | Lightweight, schema-generated types |
+
+### Integration Points
+- Import/export endpoints (`/api/fhir/export`, `/api/fhir/import`)
+- Conversion layer between `BiomarkerEntry` ↔ FHIR `Observation`
+
+---
+
+## Wearable Sync (Phase 5)
+
+| Platform | API |
+|----------|-----|
+| Google Health Connect | Android SDK (not FHIR) |
+| Apple HealthKit | iOS SDK |
+| Oura/Fitbit | REST APIs |
+
+Data flows: `Wearable → App → Backend → (optional) FHIR export`
+
+---
+
+## Other Future Ideas
+
+- [ ] Lab Report OCR (PDF/image parsing)
+- [ ] Family sharing with consent management
+- [ ] Telehealth integration
+- [ ] Longitudinal trend predictions with ML