remove opencode

Manages `~/.pi/agent` config via the itme-brain/pi submodule and
provides nodejs_20 with NPM_CONFIG_PREFIX=~/.npm-global so pi and its
extensions install via the global npm ecosystem.

Pi itself and extensions like pi-mcp-adapter are installed manually
via `npm install -g` rather than packaged through nix — the ecosystem
moves too fast to keep derivations current.

system/machines/desktop/default.nix

@@ -11,7 +11,6 @@
     ../../keys
     ../../modules/sops
     ../../modules/docker
-    ../../modules/nix-ld
     ./hardware.nix
     ./system.nix
   ];

system/machines/server/default.nix

@@ -10,7 +10,6 @@
     ../../../user
     ../../keys
     ../../modules/sops
-    ../../modules/nix-ld
     ./hardware.nix
     ./system.nix
   ];

system/machines/wsl/default.nix

@@ -10,7 +10,6 @@
     ../../../user
     ../../keys
     ../../modules/sops
-    ../../modules/nix-ld
     ./system.nix
   ];
 }

system/modules/nix-ld/default.nix

@@ -1,39 +0,0 @@
-{ pkgs, lib, config, ... }:
-
-with lib;
-let
-  cfg = config.modules.system.nix-ld;
-
-in
-{
-  options.modules.system.nix-ld = {
-    enable = mkOption {
-      type = types.bool;
-      default = any
-        (user: user.modules.user.neovim.enable or false)
-        (attrValues config.home-manager.users);
-      description = "Enable nix-ld so Mason-installed Neovim tools can run on NixOS.";
-    };
-  };
-
-  config = mkIf cfg.enable {
-    programs.nix-ld = {
-      enable = true;
-      libraries = with pkgs; [
-        curl
-        expat
-        fontconfig
-        freetype
-        glib
-        icu
-        libgcc
-        libGL
-        libxkbcommon
-        openssl
-        stdenv.cc.cc
-        zlib
-        zstd
-      ];
-    };
-  };
-}

user/modules/neovim/nvim

@@ -1 +1 @@
-Subproject commit f11e6a02db5cd8e4c8c1bdec0d34557ff995c32c
+Subproject commit da6106c77470b336783951ff2bce795688e9663d