TP-032 complete

Implemented and documented five MCP Prompts: training_analysis, recovery_check, weekly_planning, race_week_taper, and coach_roster_triage.

Verification passed:
- make test
- make build
- make lint
- go test -race ./...
- go test ./internal/mcp -run 'TestProtocolSharedTransportSuite/prompts_list_and_get' -count=1
