diff --git a/flake.nix b/flake.nix
deleted file mode 100644
index bd12a9e..0000000
--- a/flake.nix
+++ /dev/null
@@ -1,31 +0,0 @@
-# SPDX-License-Identifier: MPL-2.0
-# SPDX-FileCopyrightText: 2024-2026 Jonathan D.A. Jewell (hyperpolymath) <j.d.a.jewell@open.ac.uk>
-#
-# Nix fallback for the cyo dev environment (Guix is primary; see guix.scm).
-# Retained per standards#102 rule 3 (KEEP+DEP): this flake is the sole
-# source of `reuse` (the SPDX/REUSE-spec linter), which the Guix
-# manifest does not carry. Remove only once `reuse` is available via Guix.
-#   nix develop
-{
-  description = "cyo — choose-your-own-adventure for your craft (dev shell)";
-
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
-  inputs.flake-utils.url = "github:numtide/flake-utils";
-
-  outputs = { self, nixpkgs, flake-utils }:
-    flake-utils.lib.eachDefaultSystem (system:
-      let pkgs = import nixpkgs { inherit system; };
-      in {
-        devShells.default = pkgs.mkShell {
-          name = "cyo";
-          packages = with pkgs; [
-            bashInteractive
-            coreutils
-            asciidoctor
-            bat
-            shellcheck
-            reuse
-          ];
-        };
-      });
-}