dsh-plugin-book-deconstruct: A DSH plugin to decode books

dsh-plugin-book-deconstruct is a DeepSeek Harness Host plugin that can be invoked by an agent in any session after being installed into a profile. It structures book deconstruction into two trigger modes and two outputs: a narrative summary of the entire book and a standalone paragraph of in-depth thinking. The article is organized into a fixed structure covering plugin information, core functions, installation and activation, optional configuration, typical usage, applicable scenarios, and precautions. All commands, version numbers, and configuration items are derived from the README and package.json.