57be9065cda85253e7c0b22fbc383ab7e01fc913
Implements GET /api/profile and PUT /api/profile endpoints with validation of HR zones (must be contiguous, non-overlapping, 0-100%). Also updates profile migration to use correct HR zone defaults (0-20, 20-40, etc.) that match validation requirements. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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