Add flake.nix for NixOS integration

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1774244481,
+        "narHash": "sha256-4XfMXU0DjN83o6HWZoKG9PegCvKvIhNUnRUI19vzTcQ=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "4590696c8693fea477850fe379a01544293ca4e2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-25.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,29 @@
+{
+  description = "mcdeploy - Metacircular Deployment Tool";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";
+  };
+
+  outputs =
+    { self, nixpkgs }:
+    let
+      system = "x86_64-linux";
+      pkgs = nixpkgs.legacyPackages.${system};
+      version = "0.1.0";
+    in
+    {
+      packages.${system} = {
+        default = pkgs.buildGoModule {
+          pname = "mcdeploy";
+          inherit version;
+          src = ./.;
+          vendorHash = "sha256-C2pSj/1UZei+Us78cCIwbz76fRtjQxFioZiIDypGgns=";
+          ldflags = [
+            "-s"
+            "-w"
+          ];
+        };
+      };
+    };
+}

result

@@ -0,0 +1 @@
+/nix/store/c1fflsc9x99x0mrgg9msbpqdxspxwh7m-mcdeploy-0.1.0