Remove wixos (WSL) configuration

WSL is no longer used. This removes:
- machines/wixos/ directory and configuration.nix
- nixos-wsl input from flake.nix
- nixosConfigurations.wixos output
- References to wixos in AGENTS.md and .goosehints

Implements bead: nixos-configs-2mk

AGENTS.md

@@ -10,7 +10,7 @@ This is a NixOS configuration repository using flakes, managing multiple machine
 
 ### Flake Structure
 - **flake.nix**: Main entry point defining inputs (nixpkgs, home-manager, plasma-manager, etc.) and outputs for multiple NixOS configurations
-- **Machines**: `nix-book`, `boxy`, `wixos` (WSL configuration), `zix790prors`, `live-usb`, `johno-macbookpro` (Darwin/macOS)
+- **Machines**: `nix-book`, `boxy`, `zix790prors`, `live-usb`, `johno-macbookpro` (Darwin/macOS)
 - **Home configurations**: Standalone home-manager configuration for user `johno`
 
 ### Directory Structure
@@ -74,7 +74,6 @@ The repository also uses a modular home-manager role system for user-space confi
 - **nix-book**: Compact laptop → excludes office/media roles due to SSD space constraints
 - **boxy**: Living room media center → optimized for media consumption, excludes sync/office (shared machine)
 - **zix790prors**: All-purpose workstation → full desktop experience with all roles enabled
-- **wixos**: WSL2 development → full desktop experience, inherits from zix790prors Windows host
 - **live-usb**: Temporary environment → only base + desktop roles, no persistent services
 - **johno-macbookpro**: macOS work laptop → Darwin-specific configuration with development tools
 
@@ -107,7 +106,6 @@ darwin-rebuild build --flake .#johno-macbookpro
 - `nix-book`: Compact laptop with storage constraints, uses `home/home-laptop-compact.nix`
 - `boxy`: Shared living room media center/gaming desktop with AMD GPU, uses `home/home-media-center.nix`
 - `zix790prors`: Powerful all-purpose workstation (gaming, 3D modeling, development), dual-boots Windows 11 with shared btrfs /games partition, uses `home/home-desktop.nix`
-- `wixos`: WSL2 development environment running in Windows partition of zix790prors, uses `home/home-desktop.nix`
 - `live-usb`: Bootable ISO configuration, uses `home/home-live-usb.nix`
 - `johno-macbookpro`: macOS work laptop, uses `home/home-darwin-work.nix`