docs(roadmap): log uwsm-in-virtualization module placement (Later)

core/system/virtualization.nix wires `programs.uwsm` + the Hyprland
session config at the top of the file — loaded unconditionally on every
install, with no actual relationship to libvirt/docker. Cosmetic
mislocation, not a behavior bug; logged as a Later row so it can be
fixed in a dedicated session module without growing this audit PR.

Found during Pillar 8 audit of core/system modules.

docs/ROADMAP.md

@@ -43,6 +43,7 @@ Guardrails (apply when adding anything):
 - **Consolidate palette imports in `flake.nix` via `nomarchyLib`.** `flake.nix:79-80` re-imports `./themes/palettes` and recomputes `themeNames` even though `lib/default.nix` already exports both. Two computations, same result today — drift risk tomorrow. Import `nomarchyLib = import ./lib { inherit lib; }` once and use `nomarchyLib.{palettes,themeNames}` to make `lib/default.nix` the single source of truth for the theme list.
 - **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.
 
 ## 3. Pillar: Script & menu audit