Split button: single→3 plugs, hold-release→DJ Booth only

zigbee-monitor.yaml:
- Single click (action=single) toggles Squiggle, Sideboard Lamp,
  Bamboo Lights
- Press-hold-release (action=release after hold) toggles DJ Booth
  only
- Two filter functions: "Single click" and "Hold release", button-in
  fan-out wires to both
- DJ Booth added to zigbee-state-in and ui-text widgets for visibility
- "plugs:" list replaced with "single_plugs:" and "hold_plugs:" for
  declarative clarity (generator doesn't use them, but documents intent)

infra/zigbee2mqtt/configuration.yaml:
- Removed DJ Booth from "all_plugs" group (now Squiggle, Sideboard
  Lamp, Bamboo Lights only)
- Pushed same change to live /root/zigbee2mqtt/configuration.yaml and
  restarted zigbee2mqtt container

Diagnostics in justfile + scripts/:

justfile:
- Constants: RPI_HOST, MQTT_HOST, MQTT_PORT, RPI_DIR, NR_PORT
- rpi, mqtt-pub, mqtt-sub, mqtt-watch, mqtt-button
- nr-show, nr-diff, nr-logs, nr-editor, nr-dashboard
- z2m-devices, z2m-logs, z2m-state
- mqtt-logs, restart, restart-all

scripts/mqtt.py:
- MQTT publish/subscribe/watch helpers using paho-mqtt v2.x
- Run via uv run --with paho-mqtt (no global install needed)

scripts/diag.py:
- nr-show: live flow summary with mqtt-out topic list
- nr-diff: structural diff deployed vs repo, normalizes random uuids
- z2m-devices: paired devices + group membership
- mqtt-button: publish action and watch /set topics (E2E test)

Verified end-to-end via `just mqtt-button`:
  single  → 3 messages on .../set (Squiggle, Sideboard Lamp, Bamboo Lights)
  release → 1 message on .../set (DJ Booth)

flows/zigbee-monitor.yaml

@@ -5,10 +5,14 @@ brokers:
     host: mosquitto
     port: 1883
 
-plugs:
+# Plugs toggled on brief single press
+single_plugs:
   - Squiggle
   - Sideboard Lamp
   - Bamboo Lights
+
+# Plugs toggled on press-hold-release (action: "release" after a "hold")
+hold_plugs:
   - DJ Booth
 
 dashboards:
@@ -23,7 +27,7 @@ dashboards:
 
 flows:
   - tab: Zigbee Monitor
-    description: Single button toggles all plugs
+    description: Button dispatches single vs hold-release to different plug sets
     nodes:
       - id: zigbee-state-squiggle
         type: mqtt in
@@ -43,7 +47,7 @@ flows:
         topic: zigbee2mqtt/Bamboo Lights
         qos: 0
 
-      - id: zigbee-state-laser
+      - id: zigbee-state-djbooth
         type: mqtt in
         broker: mosquitto
         topic: zigbee2mqtt/DJ Booth
@@ -55,9 +59,9 @@ flows:
         topic: zigbee2mqtt/Door Button
         qos: 0
 
-      - id: btn-filter
+      - id: single-filter
         type: function
-        name: Single press
+        name: Single click
         code: |
           try {
             const p = JSON.parse(msg.payload);
@@ -68,6 +72,19 @@ flows:
           } catch (e) {}
           return null;
 
+      - id: hold-filter
+        type: function
+        name: Hold release
+        code: |
+          try {
+            const p = JSON.parse(msg.payload);
+            if (p.action === 'release') {
+              msg.payload = { state: 'TOGGLE' };
+              return msg;
+            }
+          } catch (e) {}
+          return null;
+
       - id: plug-out-squiggle
         type: mqtt out
         broker: mosquitto
@@ -83,7 +100,7 @@ flows:
         broker: mosquitto
         topic: zigbee2mqtt/Bamboo Lights/set
 
-      - id: plug-out-laser
+      - id: plug-out-djbooth
         type: mqtt out
         broker: mosquitto
         topic: zigbee2mqtt/DJ Booth/set
@@ -109,7 +126,7 @@ flows:
         format: "{{msg.payload.state}}"
         order: 3
 
-      - id: text-laser
+      - id: text-djbooth
         type: ui-text
         group: Plugs
         label: DJ Booth
@@ -134,7 +151,8 @@ flows:
       zigbee-state-squiggle: [text-squiggle]
       zigbee-state-sideboard: [text-sideboard]
       zigbee-state-bamboo: [text-bamboo]
-      zigbee-state-laser: [text-laser]
-      button-in: [btn-filter]
-      btn-filter: [plug-out-squiggle, plug-out-sideboard, plug-out-bamboo, plug-out-laser]
+      zigbee-state-djbooth: [text-djbooth]
+      button-in: [single-filter, hold-filter]
+      single-filter: [plug-out-squiggle, plug-out-sideboard, plug-out-bamboo]
+      hold-filter: [plug-out-djbooth]
       permit-btn: [mqtt-out]