feat(hosts): add lyrathorpe-console, a living-room games machine

New x86_64 host for a 4th-gen Core i7 (Haswell) with a GTX 1070 8 GB,
wired to a television and driven with a Bluetooth controller.

Session: greetd gets an initial_session, so the machine autologins into
the gamescope Steam session at boot with no greeter and no keyboard.
Quitting Steam falls back to greetd's default_session (ReGreet), where
the ordinary Sway session is available for keyboard-and-mouse work.

Graphics: the GTX 1070 is Pascal, so it needs driver branch 580
(nvidiaPackages.legacy_580) like the Mac Pro's Quadro P400 -- the
nixpkgs default (production, 595.x) dropped Pascal support.

Games: RetroArch built through retroarch-bare.wrapper with 17 cores
covering NES through PS2, GameCube and Wii; Clone Hero; and Steam with
Proton-GE and protontricks. RetroArch's menu toggle is bound to L3+R3,
without which there is no way to exit a running core on a machine with
no keyboard.

Proton prerequisites beyond what programs.steam already arranges: the
esync file-descriptor hard limit is raised from systemd's default
524288 to 1048576 (soft limit untouched), and Proton-GE is wired in via
extraCompatPackages. vm.max_map_count already defaults high enough in
nixpkgs and needs no override.

Content lives in a shared /srv/games tree created by systemd.tmpfiles,
laid out one directory per system under roms/ using the libretro/ES-DE
naming convention, plus bios/, saves/, states/, a Steam library folder
and Clone Hero's songs. RetroArch is pointed at it declaratively.

hardware-configuration.nix is a placeholder, not a hardware scan: the
machine is not installed yet. It assumes partition labels `nixos` and
`BOOT` and must be replaced with nixos-generate-config output.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

flake.nix

@@ -112,13 +112,27 @@
 
         # Unfree packages permitted to be built (replaces blanket allowUnfree).
         # The NVIDIA entries are for the Mac Pro's Quadro P400 (hosts/MacPro31/
-        # nvidia.nix); unfree packages are not in the binary cache, so the
-        # kernel module is compiled on the host.
+        # nvidia.nix) and the Console host's GTX 1070 (hosts/Console/nvidia.nix);
+        # unfree packages are not in the binary cache, so the kernel module is
+        # compiled on the host. The steam/clonehero entries are the Console
+        # host's games stack (hosts/Console/gaming.nix).
         unfreePackages = [
           "claude-code"
           "nvidia-x11"
           "nvidia-kernel-modules"
           "nvidia-settings"
+          "steam"
+          "steam-unwrapped"
+          "steam-run"
+          "clonehero"
+          # RetroArch cores whose upstream licences carry a non-commercial or
+          # no-redistribution-for-profit clause. Everything else in the core set
+          # is plain free software.
+          "libretro-snes9x"
+          "libretro-genesis-plus-gx"
+          "libretro-picodrive"
+          "libretro-fbneo"
+          "libretro-mame2003-plus"
         ];
 
         # Per-user identity, keyed by username. See README "Users".
@@ -293,6 +307,28 @@
             ];
           };
 
+          lyrathorpe-console = {
+            system = "x86_64-linux";
+            portable = false;
+            # Living-room games machine on a television: autologins into the
+            # gamescope Steam session (hosts/Console/gaming.nix). sway.nix is
+            # still imported -- greetd/ReGreet is what the Steam session falls
+            # back to, and Sway is the keyboard-and-mouse session behind it.
+            modules = [
+              ./hosts/Console/configuration.nix
+              ./modules/desktop.nix
+              ./modules/ssh.nix
+              inputs.nixos-hardware.nixosModules.common-pc-ssd
+              inputs.nixos-hardware.nixosModules.common-cpu-intel
+              ./modules/sway.nix
+            ];
+            users.lyrathorpe.homeModules = [
+              ./home
+              ./users/lyrathorpe/home.nix
+              ./home/desktop.nix
+            ];
+          };
+
           emmathorpe-edaas = {
             system = "x86_64-linux";
             modules = [