refactor(hosts): never load example.lua; make it a pure template

hyprland.lua now just uses its defaults when no hosts/<hostname>.lua
matches, instead of requiring hosts/example.lua. example.lua is kept only
as a documented template for contributors.

hypr/hosts/example.lua

@@ -1,7 +1,10 @@
--- example.lua - no-op host fallback (mirrors example.conf)
+-- example.lua — TEMPLATE for a per-host config file (NOT loaded at runtime).
 --
--- Used by hyprland.lua when the machine's hostname does not match any
--- hosts/<hostname>.lua file. Keep this file empty (or add shared defaults).
--- Create a file named after your host, e.g. hosts/MyHost.lua, to override
--- host-specific settings.
+-- Hyprland's Lua config only loads hosts/<hostname>.lua matching the current
+-- machine's hostname. If none matches, hyprland.lua simply uses its defaults.
+-- This file is never required; it exists purely as a documented template.
+--
+-- To add your own machine, copy this to hosts/<your-hostname>.lua and fill it
+-- in. The hostname lookup strips any domain suffix (e.g. "laptop.home" -> "laptop").
+
 return {}