feat(tools): add Umbriel window launcher toggle script

dot_local/bin/executable_umbriel-launch

@@ -0,0 +1,25 @@
+#!/bin/sh
+# umbriel-launch PATTERN COMMAND...
+# Focus the next workspace window whose app id matches PATTERN (a
+# case-insensitive jq regex), cycling through matches on repeated presses;
+# with none open, spawn COMMAND. Scratchpad windows are skipped: they have
+# their own toggles. Umbriel counterpart of niri-launch / omarchy-cycle.
+set -eu
+
+[ $# -ge 2 ] || { echo "usage: umbriel-launch PATTERN COMMAND..." >&2; exit 2; }
+pattern=$1
+shift
+
+# Matches in a stable order (window id); the one after the focused match, or
+# the first when focus is elsewhere.
+target=$(umbriel windows --json | jq -r --arg p "$pattern" '
+    [.[] | select(.scratchpad == "" and (.app_id | test($p; "i")))] | sort_by(.id)
+    | if length == 0 then empty
+      else (map(.focused) | index(true)) as $i
+        | if $i == null then .[0].id else .[($i + 1) % length].id end
+      end')
+
+if [ -n "$target" ]; then
+    exec umbriel msg "window-focus:$target"
+fi
+exec umbriel msg spawn "$@"