dsh-granular-prompt: DeepSeek Harness Prompt Composition Management Plugin

The DeepSeek Harness plugin `dsh-granular-prompt` provides a plugin-based architecture that enables fine-grained prompt management for developers. Through the Prompt tab in Granular Settings and the Persona Picker in the chat editor, it supports visual editing and management of prompts. Core features include real-time viewing of prompt lists, disabling or replacing specific sections, managing a custom system prompt library, and quickly switching between global and session-level configurations via the Persona library. Installation depends on components such as `dsh-granular-settings` and `dsh-scratchpad`. This tool visualizes the prompt assembly process, addressing the lack of visibility in prompt construction and making it suitable for precise developer control and debugging.