dsh-tabbit: The Official DeepSeek Harness Plugin for Tabbit Browser

`dsh-tabbit` is an official plugin for DeepSeek Harness (DSH), designed to resolve the tension between environment isolation and state retrieval using a real Tabbit browser. It provides core capabilities such as `tabbit_browser` and `web_fetch`, enabling direct operation of real pages, logged-in states, and interactions within DSH. The plugin includes page-read permission controls, context selection (`@` mentions), and diagnostic tools. Installation requires Node ≥ 22.19, dsh ≥ 0.1.1-rc.2, and a Tabbit browser environment. When in use, configure the instance ID and permission policies to ensure secure web access.