dsh-ds-attach: DeepSeek Harness Attachment Upload and Document Text Injection Plugin

dsh-ds-attach is an MIT-licensed DeepSeek Harness plugin (v0.1.0, depends on @deepseek-ai/cordis ^4.0.1) maintained by wqx-txdsyl, aiming to replicate the attachment experience of chat.deepseek.com for the DSH web client. Core features include: uploading files via the paperclip button or drag-and-drop; displaying 240x64px file cards with official icons and status (uploading/parsing/completed/failed); supporting text extraction for PDF, DOCX, XLSX, TXT/MD, and code files (default 150,000 character budget, truncation at paragraph boundaries); injecting extracted text into messages for the model to read; and automatically clearing the attachment area after sending. Images automatically go through the native vision pipeline, scanned P.