fix: remove outputs dependency from base module

Overlays are handled by the consuming flake (nixos-config) at the NixOS
level. The base module now only sets nixpkgs.config and user-level prefs.

profiles/base/default.nix

@@ -1,17 +1,23 @@
 # profiles/base/default.nix — Always loaded on every host.
 #
 # Provides:
-#   - nixpkgs overlays and config (unfree, nix-colors, m3ta-nixpkgs)
+#   - nix-colors and m3ta-nixpkgs HM module imports
 #   - Shell (nushell, fish, starship) with enable options
 #   - CLI tools (bat, carapace, direnv, eza, fzf, lf, nitch, television, zellij, zoxide)
 #   - Secrets management (pass-wayland)
-#   - Base packages (libgtop)
+#   - Color scheme (dracula)
+#   - Base packages
+#
+# NOTE: Overlays are NOT set here. The consuming flake (nixos-config) handles
+# overlays at the NixOS level via nixpkgs.overlays. This module only imports
+# HM modules and sets user-level preferences.
+#
+# When used standalone (not through NixOS), overlays should be set by the
+# standalone HM configuration or by the consuming flake.
 {
   inputs,
   lib,
-  outputs,
   pkgs,
-  system,
   ...
 }: {
   imports = [
@@ -24,23 +30,9 @@
   ];
 
   # ── nixpkgs configuration ──
-  nixpkgs = {
-    overlays = [
-      outputs.overlays.temp-packages
-      outputs.overlays.stable-packages
-      outputs.overlays.locked-packages
-      outputs.overlays.pinned-packages
-      outputs.overlays.master-packages
-
-      inputs.nur.overlays.default
-      inputs.m3ta-nixpkgs.overlays.default
-      inputs.m3ta-nixpkgs.overlays.modifications
-      (outputs.lib.mkLlmAgentsOverlay system)
-    ];
-    config = {
-      allowUnfree = true;
-      allowUnfreePredicate = _: true;
-    };
+  nixpkgs.config = {
+    allowUnfree = true;
+    allowUnfreePredicate = _: true;
   };
 
   # ── Nix settings ──