logiguard fork v2: patched GPUI on verified 8c74db0 tree

Rebuilt from the exact zed-industries/zed @ 8c74db00c4053d6c0a9037863d7bd048658da4ca
tree (previous orphan was based on a stale/wrong fetch). Same 3-file patch:
  - serial.rs: add SerialKind::KeyboardEnter
  - client.rs: store wl_keyboard.enter serial; add latest_serial_of()
  - window.rs: activate() uses keyboard-enter serial (Mutter focus gate)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

nix/modules/packages.nix

@@ -0,0 +1,15 @@
+{ inputs, ... }:
+{
+  perSystem =
+    { pkgs, ... }:
+    let
+      mkZed = import ../toolchain.nix { inherit inputs; };
+      zed-editor = mkZed pkgs;
+    in
+    {
+      packages = {
+        default = zed-editor;
+        debug = zed-editor.override { profile = "dev"; };
+      };
+    };
+}