refactor: move rust dev shell into 'rust' directory

rust/.gitignore

@@ -0,0 +1 @@
+/target

rust/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "sandbox-rust"
+version = "0.1.0"

rust/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "sandbox-rust"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

rust/flake.lock

@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": "nixpkgs-lib"
+      },
+      "locked": {
+        "lastModified": 1763759067,
+        "narHash": "sha256-LlLt2Jo/gMNYAwOgdRQBrsRoOz7BPRkzvNaI/fzXi2Q=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "2cccadc7357c0ba201788ae99c4dfa90728ef5e0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1764950072,
+        "narHash": "sha256-BmPWzogsG2GsXZtlT+MTcAWeDK5hkbGRZTeZNW42fwA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "f61125a668a320878494449750330ca58b78c557",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-lib": {
+      "locked": {
+        "lastModified": 1761765539,
+        "narHash": "sha256-b0yj6kfvO8ApcSE+QmA6mUfu8IYG6/uU28OFn4PaC8M=",
+        "owner": "nix-community",
+        "repo": "nixpkgs.lib",
+        "rev": "719359f4562934ae99f5443f20aa06c2ffff91fc",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "nixpkgs.lib",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-parts": "flake-parts",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

rust/flake.nix

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+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-parts.url = "github:hercules-ci/flake-parts";
+  };
+
+  outputs =
+    inputs@{ flake-parts, ... }:
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      systems = [
+        "x86_64-linux"
+        "aarch64-linux"
+        "x86_64-darwin"
+        "aarch64-darwin"
+      ];
+
+      perSystem =
+        { pkgs, ... }:
+        {
+          devShells.default = pkgs.mkShell {
+            buildInputs = with pkgs; [
+              cargo
+              clippy
+              evcxr
+              rust-analyzer
+              rustc
+              rustfmt
+            ];
+          };
+        };
+    };
+}

rust/src/main.rs

@@ -0,0 +1,2 @@
+fn main() {
+}