Env Check

Read-only health inspection of the local development environment. Diagnoses "can it run", never tunes performance, never scans for threats, and never executes a fix — every finding carries a fix command for the user to run themselves.

中文速览（Quick Guide）

• 做什么：对开发环境做只读体检（六维：工具链／环境变量／WSL 互操作／磁盘与 inode／端口占用（--ports 指定）／依赖完整性），产出 [级别] 标题＋证据＋修复命令 的报告与 --json 机读版。
• 何时用：「我这里跑不起来／明明装了却找不到命令」「代理挂着但装不动包」「WSL 里命中了 Windows 侧的二进制」等环境类问题。
• 核心步骤：跑 scripts/env-check.py（自测先过 --selftest）→ 逐条读 FAIL/WARN → 把 fix: 行的命令原样给用户确认执行（本技能永不代执行）→ 需要平台细节查 references/。
• 国内可达性边界：全部检测本地完成、零依赖零网络（代理连通性探测是对用户已配置代理的本机端口探测）；无外链、无下载。

When to Use

• A build or install fails with environment-flavored symptoms: command not found for an installed tool, wrong binary version, proxy timeouts.
• User asks for an environment checkup / "体检" / "为什么我这里跑不起来".
• On WSL: suspicious Windows-side shadowing (/mnt/c/... binaries winning), CRLF churn.

NOT for: performance tuning (CPU/memory/disk speed), security scanning of code or dependencies, project config review, AI session health.

Hard Constraints