Refactor shell.nix to import overlays and yay. Better fitted for doomsday scenario

shell.nix

@@ -1,4 +1,4 @@
-# Shell for bootstrapping flake-enabled nix and other tooling
+# This is a Nix flake shell that provides a minimal environment for new install or system recovery
 {
   pkgs ?
     # If pkgs is not defined, instantiate nixpkgs from locked commit
@@ -8,23 +8,72 @@
         url = "https://github.com/nixos/nixpkgs/archive/${lock.rev}.tar.gz";
         sha256 = lock.narHash;
       };
+      # Import overlays from the flake's overlay structure
+      overlays = [
+        (import ./overlays { inputs = { }; }).default
+      ];
     in
-    import nixpkgs { overlays = [ ]; },
+    import nixpkgs { inherit overlays; },
   ...
 }:
+let
+  # Explicitly add the yay package to the shell in case overlay fucks up
+  yay = import ./pkgs/yay/package.nix { inherit pkgs lib; };
+  inherit (pkgs) lib;
+in
 {
   default = pkgs.mkShell {
-    nativeBuildInputs = builtins.attrValues {
+    nativeBuildInputs =
+      builtins.attrValues {
         inherit (pkgs)
-
+          # Basic nix tools
           nix
+          nixos-rebuild
           home-manager
           nh
+
+          # Git for repo management
           git
+
+          # Shells
           fish
+          bash
+
+          # Config tools
           dconf2nix
-        bats # for bash testing
+
+          # Network tools (for recovery scenarios)
+          curl
+          wget
+
+          # System tools
+          coreutils
+          findutils
+          gzip
+          zstd
+
+          # Text editors for emergency config edits
+          micro
+          nano
+
+          # Diagnostics
+          inxi
+          pciutils
+          usbutils
+          lshw
           ;
-    };
+      }
+      ++ [
+        yay
+      ];
+
+    FLAKE = toString ./.;
+
+    shellHook = ''
+      clear
+      echo "Minimal shell initialized with flake overlays"
+      echo -e "Run '\033[1;34myay rebuild\033[0m' to rebuild your system if needed"
+      echo -e "FLAKE environment variable is set to: \033[1;34m$FLAKE\033[0m"
+    '';
   };
 }