docs: 시스템 아키텍처 및 명령어 문서 추가

- COMMAND.md: 다양한 명령어와 설명 추가
- .claude/commands/design/1-system-architecture: 시스템 아키텍처 관련 문서 삭제
- .claude/commands/sc: 코드 분석, 빌드, 클린업, 설계, 문서화, 추정, 설명, Git 작업, 구현, 개선, 테스트, 문제 해결, 워크플로우 생성 등 다양한 명령어 문서 추가

.claude/commands/sc/spawn.md

@@ -0,0 +1,33 @@
+---
+allowed-tools: [Read, Grep, Glob, Bash, TodoWrite, Edit, MultiEdit, Write]
+description: "Break complex tasks into coordinated subtasks with efficient execution"
+---
+
+# /sc:spawn - Task Orchestration
+
+## Purpose
+Decompose complex requests into manageable subtasks and coordinate their execution.
+
+## Usage
+```
+/sc:spawn [task] [--sequential|--parallel] [--validate]
+```
+
+## Arguments
+- `task` - Complex task or project to orchestrate
+- `--sequential` - Execute tasks in dependency order (default)
+- `--parallel` - Execute independent tasks concurrently
+- `--validate` - Enable quality checkpoints between tasks
+
+## Execution
+1. Parse request and create hierarchical task breakdown
+2. Map dependencies between subtasks
+3. Choose optimal execution strategy (sequential/parallel)
+4. Execute subtasks with progress monitoring
+5. Integrate results and validate completion
+
+## Claude Code Integration
+- Uses TodoWrite for task breakdown and tracking
+- Leverages file operations for coordinated changes
+- Applies efficient batching for related operations
+- Maintains clear dependency management