docs(roadmap): log Hyprland keymap + waybar-toggle inconsistencies

Two behavioral wrinkles found during the Pillar 8 desktop-stack sweep
that need a design decision before they can be fixed. Logged as Later
rows so the audit doesn't lose them.

1. The Hyprland Wayland keymap is hardcoded to `us` in
   `core/home/config/nomarchy/default/hypr/input.conf:3`, ignoring the
   installer-chosen layout for native Wayland apps. Fix needs either a
   templated input.conf driven by a new home option, or session-level
   `XKB_DEFAULT_LAYOUT` propagation. Either path touches the installer
   heredoc and the home modules, so not a same-PR fix.

2. `nomarchy.toggles.waybar` is exported only as an env var consumed
   by the runtime toggle script. The Nix module always sets
   `programs.waybar.enable = lib.mkDefault true`, so the toggle is
   session-only — waybar comes back on every rebuild/reboot.
   Inconsistent with `toggles.idle` which correctly gates
   `services.hypridle.enable`. Needs a behavioral call (persistent
   gate vs intentional runtime-only with a clearer name).

docs/ROADMAP.md

@@ -44,6 +44,8 @@ Guardrails (apply when adding anything):
 - **Decide what to do about `features/apps/chromium/Default/Preferences`.** The module deploys a static 204-byte `Default/Preferences` (setting `extensions.theme.use_system = false`, `browser.theme.color_scheme = 2`) into chromium's mutable profile directory via Home Manager symlink. Chromium expects to write that file at runtime, so either the symlink is silently replaced on first save (losing the static defaults) or the write fails silently. The real chromium theming work happens via managed policies in `core/system/browser.nix`. Probably the user-profile deployment should be removed; needs someone with chromium-internals knowledge to confirm before deletion.
 - **`themes/templates/*.tpl` — decide what these are for.** Eleven mustache-style templates (`alacritty.toml.tpl`, `btop.theme.tpl`, `kitty.conf.tpl`, etc.) are deployed to `~/.local/share/nomarchy/templates/` via `themes/engine/files.nix`, but no script in the tree consumes them. Likely vestigial from a pre-stylix templating system. Either delete the directory + the `xdg.dataFile` deployment, or document them as user-reference assets and explain how to use them.
 - **Move `programs.uwsm` Hyprland session out of `core/system/virtualization.nix`.** Session-manager config is wired in the virtualization module by historical accident — it's loaded unconditionally on every install and has nothing to do with libvirt/docker. Move to a dedicated `core/system/session.nix` (or fold into the Hyprland feature module) so the location matches the responsibility.
+- **Route installer keymap into Hyprland's Wayland session.** `core/home/config/nomarchy/default/hypr/input.conf:3` hardcodes `kb_layout = us`. The installer writes `services.xserver.xkb.layout = "$KEYMAP_LAYOUT"` (and `console.keyMap`), but Hyprland reads its own input config on native Wayland, so a non-US user's chosen layout works in XWayland apps and the TTY console but not in native Wayland apps — surprising and inconsistent. Fix paths: (a) template `input.conf` from a new `nomarchy.keymap.{layout,variant}` home option that the installer writes alongside `formFactor`, or (b) propagate `XKB_DEFAULT_LAYOUT` via session env so Hyprland's fallback kicks in. Option (a) is the durable fix; needs the installer's heredoc to add the option write.
+- **Make `nomarchy.toggles.waybar` a Nix-level gate, or document it as runtime-only.** Today the toggle is exported as `NOMARCHY_TOGGLE_WAYBAR` env, consumed only by `nomarchy-toggle-waybar` (which pkill/exec's at runtime). The Nix module always sets `programs.waybar.enable = lib.mkDefault true`, so waybar comes back on every rebuild/reboot regardless of the toggle. Inconsistent with `toggles.idle`, which correctly gates `services.hypridle.enable`. Either gate `programs.waybar.enable` on the toggle (persistent) or rename the option to make its session-only nature obvious.
 
 ## 3. Pillar: Script & menu audit