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, 49 deletions

diff --git a/remote-dev/flake.lock b/remote-dev/flake.lock
deleted file mode 100644
index 349d5fd..0000000
--- a/remote-dev/flake.lock
+++ /dev/null
@@ -1,49 +0,0 @@
-{
-  "nodes": {
-    "home-manager": {
-      "inputs": {
-        "nixpkgs": [
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1778628724,
-        "narHash": "sha256-VNG6hJ146VEenXcDrB3t6MVnrMx+gtyCWTCDkzOp9Qs=",
-        "owner": "nix-community",
-        "repo": "home-manager",
-        "rev": "6a0bbd6b4720da1c9ce7ebf35ff5c41a82db367a",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-community",
-        "ref": "master",
-        "repo": "home-manager",
-        "type": "github"
-      }
-    },
-    "nixpkgs": {
-      "locked": {
-        "lastModified": 1778443072,
-        "narHash": "sha256-zi7/fsqM/kFdNuED//4WOCUtezGtKKqRNORjMvfwjnA=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "da5ad661ba4e5ef59ba743f0d112cbc30e474f32",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixos-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "root": {
-      "inputs": {
-        "home-manager": "home-manager",
-        "nixpkgs": "nixpkgs"
-      }
-    }
-  },
-  "root": "root",
-  "version": 7
-}