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

hosts/idols-ai/hardware-intel.nix

@@ -14,8 +14,17 @@
 
   # kvm virtualization support
   boot.initrd.kernelModules = [ ];
-  boot.kernelModules = [ "kvm-intel" ];
-  boot.extraModprobeConfig = "options kvm_intel nested=1";
+  boot.kernelModules = [
+    "kvm-intel"
+    # Provide a connected DRM output when the NVIDIA-attached monitors are off.
+    # Niri exposes it as Virtual-1 for headless Sunshine sessions.
+    "vkms"
+  ];
+  boot.extraModprobeConfig = ''
+    options kvm_intel nested=1
+    # Create Virtual-1 as soon as vkms loads, including during normal physical sessions.
+    options vkms create_default_dev=1
+  '';
   boot.extraModulePackages = [ ];
 
   # Intel Graphics