chore(devenv): update devenv and fix libiconv issue

devenv.lock

@@ -3,10 +3,11 @@
     "devenv": {
       "locked": {
         "dir": "src/modules",
-        "lastModified": 1767704193,
+        "lastModified": 1773672671,
+        "narHash": "sha256-TcU3EYJ6vVNRE6Kdhwh7wI3X6UTqyX+K84PnP03YK7Y=",
         "owner": "cachix",
         "repo": "devenv",
-        "rev": "b472e02e27003280097bfd03bcc390af7f387804",
+        "rev": "9dfa16743f60733f62634ae2826c8c8a4762e255",
         "type": "github"
       },
       "original": {
@@ -16,68 +17,13 @@
         "type": "github"
       }
     },
-    "flake-compat": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1767039857,
-        "owner": "NixOS",
-        "repo": "flake-compat",
-        "rev": "5edf11c44bc78a0d334f6334cdaf7d60d732daab",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "repo": "flake-compat",
-        "type": "github"
-      }
-    },
-    "git-hooks": {
-      "inputs": {
-        "flake-compat": "flake-compat",
-        "gitignore": "gitignore",
-        "nixpkgs": [
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1767281941,
-        "owner": "cachix",
-        "repo": "git-hooks.nix",
-        "rev": "f0927703b7b1c8d97511c4116eb9b4ec6645a0fa",
-        "type": "github"
-      },
-      "original": {
-        "owner": "cachix",
-        "repo": "git-hooks.nix",
-        "type": "github"
-      }
-    },
-    "gitignore": {
-      "inputs": {
-        "nixpkgs": [
-          "git-hooks",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1762808025,
-        "owner": "hercules-ci",
-        "repo": "gitignore.nix",
-        "rev": "cb5e3fdca1de58ccbc3ef53de65bd372b48f567c",
-        "type": "github"
-      },
-      "original": {
-        "owner": "hercules-ci",
-        "repo": "gitignore.nix",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1767364772,
+        "lastModified": 1773597492,
+        "narHash": "sha256-hQ284SkIeNaeyud+LS0WVLX+WL2rxcVZLFEaK0e03zg=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "16c7794d0a28b5a37904d55bcca36003b9109aaa",
+        "rev": "a07d4ce6bee67d7c838a8a5796e75dff9caa21ef",
         "type": "github"
       },
       "original": {
@@ -90,11 +36,7 @@
     "root": {
       "inputs": {
         "devenv": "devenv",
-        "git-hooks": "git-hooks",
         "nixpkgs": "nixpkgs",
-        "pre-commit-hooks": [
-          "git-hooks"
-        ],
         "rust-overlay": "rust-overlay"
       }
     },
@@ -105,10 +47,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1767667566,
+        "lastModified": 1773630837,
+        "narHash": "sha256-zJhgAGnbVKeBMJOb9ctZm4BGS/Rnrz+5lfSXTVah4HQ=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "056ce5b125ab32ffe78c7d3e394d9da44733c95e",
+        "rev": "f600ea449c7b5bb596fa1cf21c871cc5b9e31316",
         "type": "github"
       },
       "original": {
@@ -120,4 +63,4 @@
   },
   "root": "root",
   "version": 7
-}
+}

devenv.nix

@@ -1,6 +1,14 @@
 { pkgs, lib, inputs, config, ... }:
 let
   cfg = config.hugr;
+  darwinRuntimeLibraries = with pkgs; [
+    libiconv
+    xz
+    libffi
+    libxml2
+    ncurses
+  ];
+  darwinRuntimeLibraryPath = lib.makeLibraryPath darwinRuntimeLibraries;
 in
 {
   options.hugr = {
@@ -26,31 +34,42 @@ in
       pkgs.libffi
       pkgs.libxml2
       pkgs.ncurses
-    ] ++ lib.optionals pkgs.stdenv.isDarwin [
-      pkgs.xz
-    ];
+    ] ++ lib.optionals pkgs.stdenv.isDarwin darwinRuntimeLibraries;
 
-    env = let
-      llvmPackage = pkgs."llvmPackages_${cfg.llvmVersion}";
-      versionInfo = builtins.splitVersion llvmPackage.release_version;
-      llvmVersionMajor = builtins.elemAt versionInfo 0;
-      llvmVersionMinor = builtins.elemAt versionInfo 1;
-    in {
-      "LLVM_SYS_${llvmVersionMajor}${llvmVersionMinor}_PREFIX" = "${llvmPackage.libllvm.dev}";
-    };
+    env =
+      let
+        llvmPackage = pkgs."llvmPackages_${cfg.llvmVersion}";
+        versionInfo = builtins.splitVersion llvmPackage.release_version;
+        llvmVersionMajor = builtins.elemAt versionInfo 0;
+        llvmVersionMinor = builtins.elemAt versionInfo 1;
+      in
+      {
+        "LLVM_SYS_${llvmVersionMajor}${llvmVersionMinor}_PREFIX" = "${llvmPackage.libllvm.dev}";
+      } // lib.optionalAttrs pkgs.stdenv.isDarwin {
+        # `uv` and other prebuilt binaries on macOS can link against `libiconv.2`
+        # without carrying an absolute runtime path to the Nix-provided library.
+        # Make the fallback loader path explicit so `uv sync` stays stable across
+        # devenv/nixpkgs updates instead of depending on incidental shell state.
+        DYLD_FALLBACK_LIBRARY_PATH = darwinRuntimeLibraryPath;
+      };
 
 
     enterShell = ''
       cargo --version
+      # UV_PYTHON is set by devenv to the Nix python-env derivation, which carries
+      # an EXTERNALLY-MANAGED marker. This causes `uv pip install` (invoked by
+      # maturin) to target the immutable Nix store Python instead of the project
+      # venv. Unset it so uv resolves the interpreter from the active venv instead.
+      unset UV_PYTHON
     '';
 
     languages.python = {
       enable = true;
+      venv.enable = false;
       uv = {
         enable = true;
         sync.enable = true;
       };
-      venv.enable = true;
     };