iyllyt/dsh-btw: Adding a /btw Bypass Question Plugin for DSH

dsh-btw is an unofficial community plugin for DeepSeek Harness (DSH) designed to address the "in-between" issue where users need to confirm current context details while the main Agent is busy. It allows users to submit one-off quick questions via the `/btw` command during parallel execution of main tasks, with responses displayed in a temporary panel and not recorded in the main session history. The plugin reuses the model configuration and context of the parent session but does not execute tools or engage in multi-turn follow-up questions, making it unsuitable for tasks requiring tool permissions, such as reading new files, executing commands, or performing online searches. Its core advantages include session isolation, privacy protection, and a cache protection mechanism. Users can choose from three archiving modes: private-jsonl (default, local private storage), memory, or none, and can abort requests by closing the panel. The plugin adopts a modular design for easy integration and extension.