Validate a skill repository for required files, JSON structure, frontmatter, and executable permissions.
commands/skill-squared/## Goal
Run `/skill-squared:validate` on a skill directory (standalone or marketplace) to ensure it meets publishing requirements.
## Inputs
- `skill_dir`
- Optional `skill_name`
- `strict` flag (optional) for additional linting
## Steps
1. Confirm directory exists. If `skill_name` omitted, auto-detect by reading `.claude-plugin/plugin.json` or the lone file inside `skills/`.
2. Load validation config from `config/marketplace-config.json -> skill-squared.validation`.
3. **Required files**: iterate through configured patterns (expand `{skill_name}`) and ensure each exists. Record missing i...Validate specifications, implementations, or understanding. Works with spec IDs, file paths, or freeform validation requests at any lifecycle stage.
[オプション] プロジェクト検証（env/依存/ビルド/テスト/デプロイ準備）
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