feat(shardr): Add shardr package to the overlay

Decentralized LLM repository (Go): content-addressed model store with
BitTorrent-based sync and OpenAI-compatible serving via llama-server.
Upstream has no tagged source releases, so the package is pinned to
main HEAD (fab7fa8) with a nix-update script targeting the branch.
Builds both shardr and shardhive binaries.

README.md

@@ -27,6 +27,7 @@ A custom Nix overlay and flake providing additional packages not found in upstre
 | `mcp-gateway` | Universal Model Context Protocol gateway that sits between AI client and MCP tools/servers | MCP Servers |
 | `nftables-analyzer` | Analyze nftables firewall rules and evaluate traffic queries | Networking |
 | `nftablesbuilder` | Web interface to manage nftables rules with drag-and-drop rule creation | Networking |
+| `shardr` | Decentralized LLM repository: content-addressed model store, BitTorrent-based sync, OpenAI-compatible serving via llama-server | AI Inference |
 | `skillsmcp` | MCP server that exposes Agent Skills to AI agents via the Model Context Protocol | MCP Servers |
 | `kubernetes-mcp-server` | Model Context Protocol (MCP) server for Kubernetes and OpenShift | MCP Servers |
 | `llama-cpp` | llama.cpp pinned to build b9645, built for Strix Halo (gfx1151) with ROCm + Vulkan backends | AI Inference |

packages/shardr/default.nix

@@ -0,0 +1,2 @@
+{ pkgs, ... }:
+pkgs.callPackage ./package.nix { }

packages/shardr/package.nix

@@ -0,0 +1,48 @@
+{
+  lib,
+  buildGoModule,
+  fetchFromGitHub,
+}:
+
+buildGoModule rec {
+  pname = "shardr";
+  # Pinned to a commit: upstream has no tagged source releases, only
+  # prebuilt "shardr-runner" bundles.
+  version = "0.1.0+unstable";
+
+  src = fetchFromGitHub {
+    owner = "Cyb3rDudu";
+    repo = "shardr";
+    rev = "fab7fa89bc8164181c5bcebd1f23a74825d11de1";
+    hash = "sha256-bbNvTU3rSlKD7Wr+Q+WGKKtIVUq6uzmv93uZq0gzO2U=";
+  };
+
+  vendorHash = "sha256-wI7oVOFEKDK2hr7MmJ/QY9Mqwgk6t24cBe8HSM/zpVo=";
+
+  subPackages = [
+    "cmd/shardr"
+    "cmd/shardhive"
+  ];
+
+  # Upstream tests assume a llama-server binary and a live shardhive socket.
+  doCheck = false;
+
+  passthru = {
+    category = "AI Inference";
+    updateScript = [
+      "nix-update"
+      "--flake"
+      ".#shardr"
+      "--version=branch=main"
+    ];
+  };
+
+  meta = {
+    description = "Decentralized LLM repository with sync-based distribution over a BitTorrent peer network";
+    homepage = "https://github.com/Cyb3rDudu/shardr";
+    changelog = "https://github.com/Cyb3rDudu/shardr/releases";
+    license = lib.licenses.asl20;
+    maintainers = [ ];
+    mainProgram = "shardr";
+  };
+}