Split user defaults into skel seed, finalize, and resync

Reorganizes Omarchy 4 around three layers for populating $HOME:

  Seed:     omarchy-settings ships defaults to /etc/skel; useradd -m
            copies them on user creation
  Finalize: omarchy-finalize-user (renamed from omarchy-setup-user)
            handles only the runtime tweaks /etc/skel can't do — skill
            symlinks, xdg-user-dirs, default browser/mailto, vconsole→hypr
            keyboard sync, and install/user/all.sh
  Resync:   omarchy-reinstall-configs is the explicit, destructive
            resync of /etc/skel into an existing user's $HOME

Package-owned files move out of config/ into default/, where the
omarchy-settings PKGBUILD installs them to real system paths:

  config/environment.d/fcitx.conf            -> /usr/lib/environment.d/
  config/fontconfig/fonts.conf               -> /usr/share/fontconfig/conf.avail/
  config/mimeapps.list                       -> /usr/share/applications/
  config/omarchy.ttf                         -> /usr/share/fonts/omarchy/
  config/systemd/user/*.service              -> /usr/lib/systemd/user/
  config/uwsm/default                        -> /usr/share/omarchy/default/uwsm/
  config/uwsm/env                            -> /usr/share/uwsm/env.d/10-omarchy
  config/xdg-terminals.list                  -> /usr/share/xdg-terminal-exec/

omarchy-upgrade-to-4 grows a 'retire' action (renamed from 'move' to
clarify nothing is copied — the system path is owned by the new package
once the user's hash-matched ~/.config copy is removed). Mismatched
copies are kept as backups so user overrides survive the upgrade.

Other simplifications:

  - Single env bootstrap at default/bash/env-bootstrap sourced by
    /etc/profile.d/omarchy.sh, /etc/skel/.bashrc,
    /usr/share/uwsm/env.d/10-omarchy, and default/bash/envs. PATH
    prepend only in dev-link mode (production uses /usr/bin/omarchy-*).
  - omarchy-refresh-config reads from /etc/skel/.config so refresh
    means 'snap to skel'.
  - omarchy-reinstall-configs collapses to 'cp -af /etc/skel/. ~/'
    plus limine/plymouth/nvim refresh.
  - omarchy-font-set uses awk against our own 30-omarchy.conf instead
    of xmlstarlet; xmlstarlet dropped from omarchy-base.packages.
  - Defer user systemd enables (bt-agent, sleep-lock,
    recover-internal-monitor) to first-run via
    install/user/first-run/enable-user-units.sh; delete
    omarchy-user-systemctl-enable and the per-hardware install
    scripts that called it.
  - Wireplumber bluetooth-a2dp-autoconnect.conf moves to config/ so
    /etc/skel ships it; install/user/hardware/bluetooth.sh deleted.
  - Default terminal switched to foot.desktop.
  - docs/file-layout.md documents the three-layer model and the
    build-time repo→path map.

AGENTS.md

@@ -78,7 +78,7 @@ The ISO owns installation orchestration. This repo ships target-side setup comma
 
 - `bin/omarchy-setup-system` runs root-owned system setup during ISO finalization.
 - `bin/omarchy-setup-hardware` runs idempotent hardware-specific setup and is called by `omarchy-setup-system`.
-- `bin/omarchy-setup-user` runs user setup for the initial user and future users.
+- `bin/omarchy-finalize-user` runs the per-user runtime finalization (skill symlinks, xdg-user-dirs, mime defaults, `install/user/all.sh`). Shipped user defaults are seeded by `/etc/skel` from `omarchy-settings`, not by this command. `bin/omarchy-reinstall-configs` is the explicit destructive resync of those defaults into an existing user's `$HOME`.
 - leaf scripts under `install/` are sourced by `run_logged $OMARCHY_INSTALL/path/to/script.sh` and intentionally do not have shebangs.
 - avoid `exit` in sourced setup scripts unless intentionally aborting setup.
 - use `$OMARCHY_INSTALL` and `$OMARCHY_PATH` instead of hard-coded Omarchy paths.
@@ -171,7 +171,7 @@ To copy a default config to user config with automatic backup:
 omarchy-refresh-config hypr/hyprlock.conf
 ```
 
-This copies `$OMARCHY_PATH/config/hypr/hyprlock.conf` to `~/.config/hypr/hyprlock.conf`.
+This copies `/etc/skel/.config/hypr/hyprlock.conf` to `~/.config/hypr/hyprlock.conf`.
 
 # Migrations