feat(gig): make gig-up idempotent — converge the rig, never spawn dupes

Follow-up to the live launch test: re-running gig-up while the rig was
already up would have opened a SECOND Ardour on the same session (an
'already open / locked' dialog) and a second Pulsar. Only SuperDirt was
guarded (skip if scsynth up).

Added ardour_up() (pgrep -f 'ardour-[0-9]', since the real binary is
ardour-9.2.0 behind the ardour9 wrapper script) and pulsar_up(), and gated
both launches on them. Now gig-up is a converge-to-ready button: run it at
any point and it starts only what's missing. Verified live with the full
rig up — SuperDirt/Ardour/Pulsar all correctly reported 'already running,
skipping', nothing duplicated. Serves #18 (dance with sound, not setup).

gig-up.sh

@@ -30,6 +30,10 @@ scsynth_up(){ pgrep -x scsynth >/dev/null 2>&1; }
 osc_up(){ ss -uln 2>/dev/null | grep -q ':57120'; }
 # SuperCollider's ALSA-seq client appears once MIDIClient.init has run.
 midi_claimed(){ aconnect -l 2>/dev/null | grep -qiE "client [0-9]+: 'SuperCollider'"; }
+# GUI apps — so re-running gig-up converges the rig instead of spawning dupes
+# (a 2nd Ardour on the same session = an annoying "already open/locked" dialog).
+ardour_up(){ pgrep -f 'ardour-[0-9]' >/dev/null 2>&1; }
+pulsar_up(){ pgrep -x pulsar >/dev/null 2>&1; }
 
 # --- terminal for the sclang post window ---
 pick_term(){
@@ -99,14 +103,20 @@ while :; do
 done
 
 # 3) Ardour — now safe to open (SuperDirt already holds the controller)
-if [ -f "$ARDOUR_SESSION" ]; then
+if ardour_up; then
+  ok "Ardour already running — skipping."
+elif [ -f "$ARDOUR_SESSION" ]; then
   LAUNCH_ARGS=("$ARDOUR_SESSION"); launch_bin "Ardour" ardour ardour9 ardour8 Ardour
 else
   warn "Ardour session not found at: $ARDOUR_SESSION"
 fi
 
 # 4) Pulsar — the Tidal folder
-LAUNCH_ARGS=("$DIR"); launch_bin "Pulsar" pulsar
+if pulsar_up; then
+  ok "Pulsar already running — skipping."
+else
+  LAUNCH_ARGS=("$DIR"); launch_bin "Pulsar" pulsar
+fi
 
 echo
 ok "gig-up done. SuperDirt owns the LaunchControl; Ardour + Pulsar are coming up."