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/test.md

@@ -0,0 +1,34 @@
+---
+allowed-tools: [Read, Bash, Glob, TodoWrite, Edit, Write]
+description: "Execute tests, generate test reports, and maintain test coverage"
+---
+
+# /sc:test - Testing and Quality Assurance
+
+## Purpose
+Execute tests, generate comprehensive test reports, and maintain test coverage standards.
+
+## Usage
+```
+/sc:test [target] [--type unit|integration|e2e|all] [--coverage] [--watch]
+```
+
+## Arguments
+- `target` - Specific tests, files, or entire test suite
+- `--type` - Test type (unit, integration, e2e, all)
+- `--coverage` - Generate coverage reports
+- `--watch` - Run tests in watch mode
+- `--fix` - Automatically fix failing tests when possible
+
+## Execution
+1. Discover and categorize available tests
+2. Execute tests with appropriate configuration
+3. Monitor test results and collect metrics
+4. Generate comprehensive test reports
+5. Provide recommendations for test improvements
+
+## Claude Code Integration
+- Uses Bash for test execution and monitoring
+- Leverages Glob for test discovery
+- Applies TodoWrite for test result tracking
+- Maintains structured test reporting and coverage analysis