dsh-archify: Adds a drawing agent skill to DeepSeek Harness

dsh-archify is a DSH plugin maintained by GongYuanCaiJi, based on the MIT License and ported from tt-a1i/archify v2.14.0. The plugin generates architecture diagrams, flowcharts, sequence diagrams, data flow diagrams, and lifecycle diagrams based on JSON specifications, outputs standalone HTML files, and supports various formats including PNG, SVG, WebM, and 1200×630 share cards. Core features include the generation of five diagram types, `validate` acceptance based on deterministic validation (providing 9 showcase items and standard basic validation), Mermaid input conversion, and architecture before/after comparison (Before/Delta/After). The plugin supports both light and dark themes and multiple visual presets, and includes no telemetry, no...