feat(awgen): add AmneziaWG configuration generator package

Package alex/awgen (offline, stateless Rust CLI for AmneziaWG configs) from
the upstream Gitea repository. Source is fetched with fetchFromGitea and
pinned to the v0.1 tag; the cargo dependency hash is pinned as well.

Also list the package in the README package table and project tree.

README.md

@@ -13,6 +13,7 @@ A custom Nix overlay and flake providing additional packages not found in upstre
 | Package | Description | Category |
 |---------|-------------|----------|
 | `awg-tool` | CLI for AmneziaWG self-hosting — generates 1.0/1.5/2.0/3.0 obfuscation parameters, exports .conf and vpn:// configs, installs servers over SSH | Networking |
+| `awgen` | Offline CLI for AmneziaWG configurations — harmonises native .conf and vpn:// inputs, generates client participants and tunnels, and analyses obfuscation | Networking |
 | `aionui` | Free, open-source, Cowork app with AI Agents | AI Coding Agents |
 | `codeaf` | Coding harness and software factory for open models: hand work off, then watch every project from one terminal | AI Coding Agents |
 | `container-use` | Containerized environments for coding agents | AI Coding Agents |
@@ -211,6 +212,7 @@ nix-overlay/
 │   └── shared-nixpkgs.nix      # Dependency-sharing overlay
 ├── packages/                    # Package definitions
 │   ├── awg-tool/               # AmneziaWG parameter generation and SSH deployment CLI
+│   ├── awgen/                  # Offline AmneziaWG configuration harmoniser and generator
 │   ├── aionui/                 # AionUi - AI Cowork desktop app
 │   ├── codeaf/                 # Coding harness and software factory for open models
 │   ├── container-use/          # Containerized environments for coding agents

packages/awgen/default.nix

@@ -0,0 +1,5 @@
+{
+  pkgs,
+  ...
+}:
+pkgs.callPackage ./package.nix { }

packages/awgen/package.nix

@@ -0,0 +1,38 @@
+{
+  lib,
+  rustPlatform,
+  fetchFromGitea,
+}:
+
+rustPlatform.buildRustPackage rec {
+  pname = "awgen";
+  version = "0.1";
+
+  src = fetchFromGitea {
+    domain = "git.millerson.name";
+    owner = "alex";
+    repo = "awgen";
+    rev = "v${version}";
+    hash = "sha256-PTwOswKI08/oHTKZDZOQfPPBXhNNxot2+tpnUweZ8gg=";
+  };
+
+  cargoHash = "sha256-/ENWhp2SpcZcTk55xXsm/IHfyj86aNzH6PAb9VBtAX4=";
+
+  passthru = {
+    category = "Networking";
+    updateScript = [
+      "nix-update"
+      "--flake"
+      "awgen"
+    ];
+  };
+
+  meta = with lib; {
+    description = "Offline, stateless CLI for AmneziaWG configurations — harmonises native .conf and vpn:// inputs, generates client participants and tunnels, and analyses obfuscation";
+    homepage = "https://git.millerson.name/alex/awgen";
+    changelog = "https://git.millerson.name/alex/awgen/commits/tag/v${version}";
+    license = licenses.mit;
+    mainProgram = "awgen";
+    platforms = platforms.unix;
+  };
+}