fix(sunshine): use Intel rendering and recover remote Niri sessions (#268)

- render Niri on the Intel iGPU while retaining NVIDIA-connected physical outputs
- encode Sunshine streams with Intel VAAPI and wait for a Niri output before startup
- load VKMS persistently for headless sessions and configure `Virtual-1` at 2560x1600@60
- let Moonlight request the stream bitrate instead of enforcing a 20 Mbps host cap
- remove unsupported Dynamic Boost and global NVIDIA session overrides
- grant Sunshine access to virtual input devices
- add a Nushell recovery helper that starts a temporary greetd/Niri session from SSH
- identify and safely replace normal, standalone, or previous transient Niri sessions
- launch the transient service in the background and verify greetd, Niri, and Sunshine before returning
- ignore local `.worktrees` directories and keep eval regression coverage focused on structural behavior

home/hosts/linux/12kingdoms-shoukei.nix

@@ -13,7 +13,6 @@ in
 
   modules.desktop.gaming.enable = false;
   modules.desktop.niri.enable = true;
-  modules.desktop.nvidia.enable = false;
 
   xdg.configFile."niri/niri-hardware.kdl".source =
     mkSymlink "${config.home.homeDirectory}/nix-config/hosts/12kingdoms-shoukei/niri-hardware.kdl";

home/hosts/linux/idols-ai.nix

@@ -9,7 +9,6 @@ in
 
   modules.desktop.gaming.enable = true;
   modules.desktop.niri.enable = true;
-  modules.desktop.nvidia.enable = true;
 
   programs.zed-editor.userSettings = {
     ui_font_size = 18.0;