[Phase 1][SwiftUI] TaskMaster 기반 SwiftData 학습 진행

[YuSeongChoi]

Summary

• add SwiftData learning guide under HIGPractice Phase 1
• add issue draft aligned with the existing learning template
• include TaskMaster reading order and SwiftData vs UserDefaults vs Keychain notes

Links

• Closes [Phase 1][SwiftData] TaskMaster 기반 SwiftData 학습 정리 #23

Testing

• not run (docs only)

[github-actions]

Learning log template for this merged PR:

Date	Phase	Framework	Scope	Issue	PR	Velog	Key Learning
2026-03-13	Phase			#23	#24	https://velog.io/@...

Quick add command:

scripts/add_learning_log.sh --date 2026-03-13 --phase "Phase <n>" --framework "<Framework>" --scope "<Scope>" --issue "#23" --pr "#24" --velog "https://velog.io/@..." --key "<one key learning>"