Stop describing a desktop this repository does not install

Phase 5. The README advertised two desktops that coexist -- GNOME with Forge,
Dash-to-Dock, Openbar and Vitals, alongside Hyprland -- and nothing in setup/
installed or configured any of the first one. Panama configures one desktop, and
now says so.

config/dot/forge is deleted along with its entry in link-dotfiles. It was the
hedge from when the GNOME session was still the fallback and Hyprland was being
built beside it; the hedge has been paid off. Nine files, six of which were
Forge's own editor backups that should never have been committed.

Searching for the rest of GNOME found nothing else to cut, which is recorded in
the spec so nobody goes looking again. change-settings never enabled an
extension. The mentions of Dash-to-Dock, Openbar and Vitals through the shell are
comments saying what a component was modelled on -- which intellihide behaviour
the dock reproduces, where a colour came from -- and DESKTOP-PARITY.md is the
table of what replaced what. That is provenance, and it is the reason those
components behave the way they do. Vitals in services/ is Panama's own bar
service and merely shares a name with the extension it replaced.

The handoff panel list was wrong in two places. It named Wacom, which nothing
hands off to, and Region, which is a subpage of System rather than a panel. The
nine real ones are read off the call sites and the allow-list that gates them.
The spec said it, the comment on gnome-control-center repeated it, and the README
would have made it three.

One test gap turned up and is closed. The assets contract caught a directory
under config/dot/ that nothing links, but not the inverse: a name left in the
dirs array with nothing behind it, which makes link-dotfiles point ~/.config/<name>
at a path that does not exist. Deleting Forge is the exact move that introduces
that, and nothing would have failed if the array entry had been left. A dangling
symlink is worse than a missing one, because everything that looks there finds
something. Verified by putting the entry back and watching it fail.

The audit of docs/settings.md this phase asked for needed nothing: it is generated
from PreferenceSchema.qml, a contract already fails when it goes stale, and it
carries no claim about GNOME or Forge. The README gained the section it was
missing instead -- the 121 contracts under tests/ were the main safety net in this
repository and went entirely unmentioned in it.

Claude-Session: https://claude.ai/code/session_01NvgBuSWB5sE43yWmg21ozj

setup/packages/desktop-packages

@@ -20,8 +20,10 @@ ghostty
 # The Calendar agenda opens events in this; see CalendarAgenda.qml.
 gnome-calendar
 # NOT GNOME-session residue. Panama's own Settings hands off to this for the
-# panels it deliberately does not own -- Online Accounts, Region, Colour,
-# Accessibility, Wellbeing, Wacom. See SystemSettings.qml's panel allow-list.
+# panels it deliberately does not own -- Online Accounts, Color, Sound, Network,
+# Keyboard, Privacy, Wellbeing, Accessibility, and the System panel for users,
+# date and time, region and remote desktop. See the allow-list in
+# services/SystemSettings.qml, which is what decides.
 gnome-control-center
 # install-hardware sets the nouveau blacklist and nvidia-drm.modeset with
 # grubby, which replaces an argument it already set rather than appending a