fix(autoswitch): WorkspacesChanged output-set diff; unit paths; deploy symlinks

- niri 26.04 has no hotplug event: OutputConfigChanged is only an ACK
  (niri-ipc). Watch WorkspacesChanged, diff sorted output set, apply on
  change. Proven live: eDP-1 off/on -> 3 output-set transitions, each
  matched + applied + reloaded.
- unit: %h/.local/bin/desk-autoswitch.sh, quoted Environment, drop
  User/Group (user unit); add desk-autoswitch.sh bin symlink
- desk.sh: silence validate/load-config/notify stdout
- deploy.sh: deploy repo symlinks (find -type l), so .local/bin links land
- docs: event semantics corrected (displays diagram, log)

scripts/desk.sh

@@ -61,7 +61,7 @@ requires() {
 
 notify() {
   # shellcheck disable=SC2086  # word splitting of the prefix is intended
-  $NOTIFY "Desk" "$1" 2>/dev/null || true
+  $NOTIFY "Desk" "$1" >/dev/null 2>/dev/null || true
 }
 
 # Apply a profile: relink, validate live config, roll back on failure,