[OliviaH05]

Summary:
Creates a safe contract for manual health measurements by defining supported metrics, accepted units, and validation rules. This is intentionally contract-only and does not yet provide measurement persistence, API endpoints, or user-facing forms.

Changes Made:

• Added documentation for supported health metrics, units, ranges, and decimal precision.
• Added backend validation for numeric measurements, blood pressure, dates, symptoms, and notes.
• Added matching frontend validation rules.
• Ensured frontend and backend metric ranges agree.
• Documented ownership and health consent requirements.
• Documented localization and accessibility requirements.
• Defined expected success, empty, validation failure, request failure, unauthorized, and consent-required states.

Closes #172

[mudabs]

Thank you, Olivia, for defining the manual health measurement contract and adding matching backend and frontend validation tests.

Please address these items before approval:

1. Rebase the branch onto current main and rerun the full CI suite.
2. Replace hardcoded English frontend validation messages with stable error keys or codes so consuming screens can localize them.
3. Add a parity test or shared contract source to prevent backend and frontend metric rules from drifting.
4. Confirm in the PR that this is intentionally contract-only and does not yet provide measurement persistence, API endpoints, or user-facing forms.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud