feat(cli): add SIGINT trap and require enter to close pane after command finishes

dot_local/bin/executable_pj-palette

@@ -11,16 +11,25 @@
 #                            run a quick-action command in ROOT
 #
 # Every item opens a full-width split along the bottom of the window (25% of
-# its height) in the project root. The command runs in the foreground; when it
-# exits the pane keeps a shell (with the output above it) instead of closing.
+# its height) in the project root. The command runs in the foreground; ctrl-c
+# stops it (the output stays). Once it has exited, enter or ctrl-c closes the
+# pane.
 
 set -uo pipefail
 self=$(readlink -f "$0")
 
+# While the task runs, ctrl-c reaches only the task: with SIGINT trapped,
+# bash survives the child's death instead of exiting along with it.
+trap : INT
+
 finish() {
-    local status=$1
-    printf '\n\033[2m[exit %s]\033[0m\n' "$status"
-    exec "${SHELL:-bash}"
+    local status=$1 key
+    printf '\n\033[2m[exit %s] enter or ctrl-c to close\033[0m' "$status"
+    trap 'exit 0' INT
+    while IFS= read -rsn1 key; do
+        [ -z "$key" ] && exit 0   # enter
+    done
+    exit 0
 }
 
 case ${1-} in