From f615dbb5d2801a22a7a42821dc9a2825eb49d98e Mon Sep 17 00:00:00 2001
From: "Jonathan D.A. Jewell" <6759885+hyperpolymath@users.noreply.github.com>
Date: Tue, 21 Jul 2026 06:23:13 +0100
Subject: [PATCH] chore(governance): add flake.nix for standards#505 gates

---
 flake.nix | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 flake.nix

diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..239554b
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,34 @@
+# SPDX-License-Identifier: MPL-2.0
+# SPDX-FileCopyrightText: 2026 Jonathan D.A. Jewell
+#
+# Development environment for affinescript.
+#
+# Estate policy is Guix primary / Nix fallback (hyperpolymath/standards).
+# This is the Nix fallback tier. It is a dev shell, not a package build:
+# it declares the toolchain needed to work on this repo, pinned to an
+# exact nixpkgs revision per the estate SHA-pinning rule.
+#
+# Packages mirror the build tooling actually present in this repo
+# (just ocaml) — not a generic estate default.
+#
+#   nix develop      # enter the shell
+#   nix flake check  # verify this file evaluates (run before committing)
+{
+  description = "affinescript development environment";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/b134951a4c9f3c995fd7be05f3243f8ecd65d798";
+
+  outputs = { self, nixpkgs }:
+    let
+      systems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
+      forAllSystems = f:
+        nixpkgs.lib.genAttrs systems (system: f nixpkgs.legacyPackages.${system});
+    in
+    {
+      devShells = forAllSystems (pkgs: {
+        default = pkgs.mkShell {
+          packages = with pkgs; [ just ocaml dune_3 ];
+        };
+      });
+    };
+}