dsh-ego-browser: Site Skill Memory for the DSH Browser Agent

`dsh-ego-browser` is a memory plugin for the DeepSeek Harness browser agent, designed to solve the problem of repeatedly learning site tool signatures and operation notes to improve efficiency. This MIT-licensed open-source plugin provides core features such as `ego_recall`, `ego_run`, and `ego_learn`, supporting tool registration, inherited storage, and environment checks. Installation requires Node.js 20 and `ego lite`, and has been validated in dsh v0.1.7-rc.2.