Add automatic dotfiles clone + stow

modules/home/dotfiles.nix clones ~/dotfiles on activation (only if not
already present) and stows every top-level package directory into
$HOME, independently per package so one conflict doesn't block the
rest. Removes home-manager's own git config management in favor of
letting the stowed ~/dotfiles/git/.gitconfig own it, and adds
homeConfigurations."tom@darwin" so the feature is usable on this Mac.
users/tom.nix now points home.dotfiles.repoUrl at the real repo.

1 files changed, 5 insertions, 0 deletions

diff --git a/flake.nix b/flake.nix
index a863509..4efe54b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -46,6 +46,11 @@
           username = "tom";
           system = "x86_64-linux";
         };
+
+        "tom@darwin" = lib.mkHome {
+          username = "tom";
+          system = "aarch64-darwin";
+        };
       };
 
       formatter = forAllSystems (system: nixpkgs.legacyPackages.${system}.nixfmt-rfc-style);