Archive filter-dotfiles-by-platform and add-gnome-desktop

Sync main specs with both completed changes: dotfiles-management
gains the platform-exclude requirement, and gnome-desktop becomes
a new main spec.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BBSd4VBfoKHjE1HR3P8kmn

1 files changed, 23 insertions, 0 deletions

diff --git a/openspec/changes/archive/2026-09-18-add-gnome-desktop/tasks.md b/openspec/changes/archive/2026-09-18-add-gnome-desktop/tasks.md
new file mode 100644
index 0000000..b1032ea
--- /dev/null
+++ b/openspec/changes/archive/2026-09-18-add-gnome-desktop/tasks.md
@@ -0,0 +1,23 @@
+## 1. GNOME desktop and login manager
+
+- [x] 1.1 In `modules/nixos/common.nix`, add `services.xserver.enable = true;` — verify by reading the file
+- [x] 1.2 Add `services.displayManager.gdm.enable = true;` and `services.desktopManager.gnome.enable = true;` — verify by reading the added block, and flag the option-path uncertainty from design.md (post-migration `services.displayManager.*`/`services.desktopManager.*` vs. older `services.xserver.displayManager.*`/`services.xserver.desktopManager.*`) as a known risk to re-check once `nix flake check` can run
+
+## 2. Networking and audio companions
+
+- [x] 2.1 Add `networking.networkmanager.enable = true;` — verify by reading the added line
+- [x] 2.2 Add `services.pipewire = { enable = true; pulse.enable = true; };` and `security.rtkit.enable = true;` — verify by reading the added block
+
+## 3. Printing
+
+- [x] 3.1 Add `services.printing.enable = true;` — verify by reading the added line
+- [x] 3.2 Add `services.avahi = { enable = true; nssmdns4 = true; openFirewall = true; };` — verify by reading the added block, and confirm `openFirewall = true` is present so mDNS/printer discovery isn't blocked by the firewall enabled in `add-developer-environment`
+
+## 4. Documentation
+
+- [x] 4.1 Update `README.md` to document that NixOS hosts from this flake now boot into GNOME (GDM login) by default, with NetworkManager, PipeWire, and CUPS+Avahi printing enabled as necessary companions — verify by reading the updated section for consistency with the actual module changes
+
+## 5. Validation
+
+- [x] 5.1 Run `nix flake check` and confirm `modules/nixos/common.nix` still evaluates without error with the new services added, resolving the option-path question from task 1.2 (ran on a machine with Nix installed — passed, confirming the post-migration `services.displayManager.*`/`services.desktopManager.*` option paths are correct)
+- [x] 5.2 Manually trace through each spec scenario in `specs/gnome-desktop/spec.md` against the implemented module, confirming each is satisfied by inspection given #5.1 cannot run locally