Install beside COSMIC instead of replacing it

The packages could not be installed. Claiming the cosmic-* names put 62 files
in conflict with 25 distribution packages -- something dnf's depsolve never
reports, because it shows up only in rpm's transaction check -- and the only
way to satisfy that was Conflicts against all 25, which erases cosmic-greeter.
On a stock Fedora COSMIC that is the display manager, so the machine comes
back to a text console with no way to log in and no session to fall back to.

So the fork ships what it actually forks. The three changed binaries take
hyprcosmic-comp, hyprcosmic-session and hyprcosmic-conf, the workflow reduces
the staged tree to those plus this fork's own assets, and cosmic-settings, the
portal, the OSD and the rest come from the distribution at the version it
tested them at. No Conflicts, no Provides, nothing erased, and the stock
COSMIC entry stays on the greeter's menu to fall back to.

Debian is the exception and keeps the whole desktop, because COSMIC is not
packaged there in any suite: there is nothing to depend on and nothing to
install beside. Its stock session entry is dropped instead, since start-cosmic
execs the cosmic-session this rename takes away.

packaging/arch/PKGBUILD

@@ -19,10 +19,14 @@ arch=('x86_64')
 url="https://github.com/outbackdingo/hyprcosmic"
 license=('GPL-3.0-only')
 
-# The HyDE shell. Without these the session starts to a blank screen: no bar,
-# no launcher, no wallpaper.
-depends=('waybar' 'rofi-wayland' 'wayland' 'libxkbcommon' 'libinput' 'seatd'
-         'mesa' 'pixman' 'libdisplay-info' 'systemd-libs')
+# cosmic-session is COSMIC itself, which this runs on rather than replaces: one
+# entry pulls the whole desktop, and cosmic-settings, cosmic-osd, the portal and
+# the rest are taken from the repositories at the version they were tested at.
+#
+# The rest is the HyDE shell. Without those the session starts to a blank
+# screen: no bar, no launcher, no wallpaper.
+depends=('cosmic-session' 'waybar' 'rofi-wayland' 'wayland' 'libxkbcommon'
+         'libinput' 'seatd' 'mesa' 'pixman' 'libdisplay-info' 'systemd-libs')
 
 # awww is in the AUR rather than in the repositories, so it cannot be a hard
 # depends without making the package uninstallable for anyone who has not built
@@ -32,15 +36,11 @@ optdepends=('awww: wallpaper daemon, required for HyDE theme wallpapers'
             'ttf-nerd-fonts-symbols: glyphs the waybar config draws with'
             'qt5ct: Qt application theming to match the GTK theme')
 
-# What "complete replacement" means in packaging terms. Every path this writes
-# under /usr/bin is one cosmic-comp and cosmic-session also own, so the two
-# cannot coexist -- which is correct, they are two builds of the same programs.
-#
-# conflicts without replaces/provides-driven auto-removal: pacman stops and
-# names the conflict rather than quietly removing the desktop the machine is
-# currently running.
-conflicts=('cosmic-comp' 'cosmic-session')
-provides=("cosmic-comp=$pkgver" "cosmic-session=$pkgver")
+# No conflicts and no provides, deliberately. This installs beside COSMIC: its
+# binaries are hyprcosmic-comp, hyprcosmic-session and hyprcosmic-conf, and it
+# writes no path that cosmic-comp or cosmic-session owns. An earlier revision
+# took the cosmic-* names and could not be installed over a COSMIC system
+# without erasing the desktop it forked.
 
 options=('!strip' '!debug')
 
@@ -56,13 +56,12 @@ package() {
     fi
     cp -a "$HYPRCOSMIC_STAGEDIR/." "$pkgdir/"
 
-    # No desktop-file-validate on the session entries. It rejects DesktopNames,
+    # No desktop-file-validate on the session entry. It rejects DesktopNames,
     # the key a display manager reads to set XDG_CURRENT_DESKTOP, because the
     # Desktop Entry Specification registers keys for application launchers and
-    # these are session files. cosmic.desktop here is upstream cosmic-session's,
-    # unchanged by this fork apart from the Exec path, and the copy Fedora ships
-    # as cosmic-session-1.5.0-1.fc44 fails the identical check -- so this is the
-    # validator's gap, not something the fork introduced. The workflow
-    # checks what actually matters instead -- that Exec names a file this
-    # package installs -- against the staged tree, before makepkg sees it.
+    # this is a session file. The copy Fedora ships as cosmic-session-1.5.0-1.fc44
+    # fails the identical check -- so this is the validator's gap, not something
+    # the fork introduced. The workflow checks what actually matters instead --
+    # that Exec names a file this package installs -- against the staged tree,
+    # before makepkg sees it.
 }