dsh-slide: AI slide editor triggered by conversation

# Introduction To enable agents to generate presentations within DeepSeek Harness (DSH), the common workflow involves first generating an outline or Markdown, which is then manually transferred to presentation software for layout. Subsequent adjustments require describing the specific changes via text in the conversation. dsh-slide adopts a different approach: it switches the current Conversation chat interface to a 16:9 slide canvas. Users only need to select objects, pages, or the entire deck, while specific modifications are executed by a dedicated annotation sub-agent. The results are reflected directly on the canvas and thumbnails. The philosophy behind DSH is "Everything is a plugin," and dsh-slide is a capability provided in this plugin format. The following sections introduce the tool in the order of features, installation, and typical usage. #