refactor(nix): promote remote-dev/ to nix/ with common/vm/host split

Restructures the Home-Manager profile to support both the Arch host and
the Ubuntu remote-dev VM from the same flake.

  - remote-dev/ → nix/ (hard rename; .chezmoiignore updated)
  - home.nix split into common.nix (shared), vm.nix (Mason runtime
    carve-outs + podman stack), host.nix (gpg scdaemon delegation to
    system pcscd)
  - flake.nix exposes homeConfigurations.{vm,host} via a mkProfile
    helper
  - rj alias in dot_zshrc updated to ~/.local/share/dotfiles/nix
  - bootstrap.sh / justfile updated to use #vm against the new path

The split is behaviour-preserving for the VM: vm.nix + common.nix
together carry the same package set as the previous home.nix.
host.nix is provisioned but not yet wired into bootstrap (phase p8).

Phase 1 of the nix-on-host migration plan.

1 files changed, 0 insertions, 38 deletions

diff --git a/remote-dev/flake.nix b/remote-dev/flake.nix
deleted file mode 100644
index 69ddafd..0000000
--- a/remote-dev/flake.nix
+++ /dev/null
@@ -1,38 +0,0 @@
-{
-  description = "Headless dev environment for remote Ubuntu VMs.";
-
-  inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
-    home-manager = {
-      url = "github:nix-community/home-manager/master";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
-  };
-
-  outputs = { self, nixpkgs, home-manager, ... }:
-    let
-      system = "x86_64-linux";
-      pkgs = import nixpkgs {
-        inherit system;
-        # Whitelist specific unfree packages (claude-code, github-copilot-cli)
-        # instead of globally setting allowUnfree, so a typo elsewhere can't
-        # silently pull in additional unfree deps.
-        config.allowUnfreePredicate = pkg:
-          builtins.elem (nixpkgs.lib.getName pkg) [
-            "claude-code"
-            "github-copilot-cli"
-          ];
-      };
-    in
-    {
-      homeConfigurations.vm = home-manager.lib.homeManagerConfiguration {
-        inherit pkgs;
-        modules = [ ./home.nix ];
-        # Path to the cloned dotfiles checkout — passed in so home.nix can
-        # symlink shared configs (nvim, zellij, zsh) from the same repo.
-        extraSpecialArgs = {
-          dotfilesRoot = ../.;
-        };
-      };
-    };
-}