feat(packages): add ds4 package with ROCm/Strix Halo backend

Add antirez/ds4 — DeepSeek V4 Flash/PRO local inference engine built
with the ROCm strix-halo target for AMD Radeon 8060S (gfx1151).
Wires up all 8 ROCm transitive dependencies (clr, hipblas, hipblas-common,
hipblaslt, hipcub, rocblas, rocprim, rocwmma) via explicit include/lib paths.

README.md

@@ -15,6 +15,7 @@ A custom Nix overlay and flake providing additional packages not found in upstre
 | `aionui` | Free, open-source, Cowork app with AI Agents | AI Coding Agents |
 | `container-use` | Containerized environments for coding agents | AI Coding Agents |
 | `desloppify` | Multi-language codebase health scanner and technical debt tracker for AI agents | AI Coding Agents |
+| `ds4` | DeepSeek 4 Flash and PRO local inference engine for ROCm (Strix Halo) | AI Inference |
 | `freebuff` | The world's strongest free coding agent | AI Coding Agents |
 | `graphify` | Turn any folder of code, docs, papers, images, or videos into a queryable knowledge graph | AI Coding Agents |
 | `hipengine` | ROCm-native local LLM inference engine with torch-free runtime for AMD RDNA GPUs | AI Inference |
@@ -115,6 +116,7 @@ nix-overlay/
 │   ├── container-use/          # Containerized environments for coding agents
 │   ├── default/                # Meta-package listing all packages
 │   ├── desloppify/             # Codebase health scanner for AI agents
+│   ├── ds4/                    # DeepSeek V4 Flash/PRO inference engine (ROCm)
 │   ├── flake-inputs/           # Utility for caching flake inputs
 │   ├── freebuff/               # Free coding agent (Codebuff)
 │   ├── graphify/               # Knowledge graph generator for code folders