Keep the Fedora section to what you have to type

The section ran longer than Ubuntu and macOS put together, and most of it
answered questions nobody asked while installing: why ffmpeg-free is enough
in detail, why the runtime directory settles after login, and why the local
models need nothing added. That last one says "do nothing", which is what
the reader would have done anyway. The reasoning stays in the pull request,
where it belongs; the README keeps the package line and the drop-in.

install.sh printed the drop-in the README already carries, six lines where
every other warning there is two. It now points at the README.

Its readiness check also went from asking whether the unit was up to asking
whether the socket is writable, which reads a stopped daemon as ready: the
socket file outlives the process. It now wants both, with pgrep for the
process so a ydotoold started by hand still counts. All five paths were
exercised with systemctl and pgrep shims, and on this Arch box the real
user service still reports ready.

install.sh

@@ -52,21 +52,17 @@ fi
 # What auto-paste needs is a socket it may write to, which is not the same
 # question as whether the unit is up: Fedora ships ydotool as a system service
 # only, and its socket stays root-owned at mode 600, so there the daemon can be
-# running while every paste is refused.
+# running while every paste is refused. The socket file outlives the daemon,
+# though, so the process has to be there as well for the answer to be yes.
 if [[ "${XDG_SESSION_TYPE:-}" != "x11" ]] && command -v ydotool >/dev/null; then
   socket="${YDOTOOL_SOCKET:-${XDG_RUNTIME_DIR:-/tmp}/.ydotool_socket}"
-  if [[ -w "$socket" ]]; then
+  alive() { pgrep -x ydotoold >/dev/null 2>&1; }
+  if [[ -w "$socket" ]] && alive; then
     ok "ydotoold is running (auto-paste ready)"
   elif systemctl is-active --quiet ydotool 2>/dev/null; then
-    warn "ydotoold runs as a system service, whose socket is not yours to"
-    say  "write to. Hand it over in /etc/systemd/system/ydotool.service.d/"
-    say  "override.conf, which is what the README's Fedora section does:"
-    say  "  [Service]"
-    say  "  ExecStart="
-    say  "  ExecStart=/usr/bin/ydotoold --socket-path=$socket --socket-own=$(id -u):$(id -g)"
-    say  "then sudo systemctl daemon-reload && sudo systemctl restart ydotool"
-  elif systemctl --user is-active --quiet ydotool 2>/dev/null \
-       || systemctl --user is-active --quiet ydotoold 2>/dev/null; then
+    warn "ydotoold's socket is not yours to write to, so auto-paste will fail"
+    say  "Hand it over with the drop-in in the README's Fedora section."
+  elif alive; then
     warn "ydotoold is running, but it did not put its socket at $socket"
     say  "Point Dikte at the one it did make: export YDOTOOL_SOCKET=..."
   else