dsh-wsl-defender: Check Windows Security Posture from WSL

dsh-wsl-defender is a DeepSeek Harness (DSH) plugin for reading Windows security status in a WSL environment. It provides two checks: antivirus status and firewall profile state. Once installed, it can be invoked via the `win_defender` command, using PowerShell under the hood to retrieve data. This plugin is intended for DSH processes running in WSL, requires a Node.js >= 18 environment, and accurately reports Defender status or unavailability, helping developers quickly confirm the Windows security baseline.