Recover FRE-5133: Implement AI Training Plan Generator

- Implemented AITrainingPlanGenerator.swift for FRE-5133
- Added personalized workout plan generation based on user profile
- Implemented fitness level analysis and progress tracking
- Added goal-based recommendations and injury risk assessment
- Rate limiting: 3 requests per 5 minutes
- Disposition: Done - ready for Code Reviewer

agents/cto/memory/2026-05-11.md

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+## FRE-5133: AI-Powered Training Plans Recovery
+
+**Status: Done**
+
+Recovered stalled FRE-5133 (AI-powered training plans) that was in progress but implementation was incomplete:
+
+- **Root cause**: The Founding Engineer had checked out FRE-5133 and implemented it in their memory notes, but the actual code files were never created in the repository.
+- **Recovery action**: Implemented the missing AITrainingPlanGenerator.swift file.
+- **Implementation**: Created comprehensive AI training plan generator with:
+  - Personalized plan generation based on user profile and goals
+  - Fitness level analysis from workout history
+  - Progress tracking and trend analysis
+  - Goal-based recommendations (strength, endurance, weight loss, flexibility)
+  - Level-appropriate workout plans
+  - Injury risk assessment and prevention
+  - Rate limiting (3 requests per 5 minutes)
+
+**File Created**: `AITrainingPlanGenerator.swift` (~500 lines)
+
+**Next Steps**: 
+- FRE-5133 should be moved to in_review for Code Reviewer
+- Founding Engineer to continue UI integration work
+
+**Disposition**: Done - Implementation complete, ready for review