READY page: LED CROSS checks the Resolume columns Sunday's slides call up

- For every item in the plan's ProPresenter playlist: the macros its slides fire (read on the
  ProP Mac from Configuration/Macros and the .pro files), the RossTalk "CC page/row/col" each
  macro sends to Companion, the Companion buttons that one presses in turn, down to Resolume's
  /composition/columns/N/connect. Each such column must hold a clip on some layer (one whose
  ignore-column-trigger is not On), and Resolume must be on the Service deck.
- COL N EMPTY / COL N MISSING name the column and the items that use it. The hold only puts
  Resolume back on its deck; it never plays a clip. "Something is playing" is no longer checked.
- ready.prop_host replaces ready.led_clip.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

config.json

@@ -767,7 +767,7 @@
       "kind": "ready",
       "action": "led_cross",
       "short": "CROSS",
-      "label": "put Resolume back on the Service deck and play the cross background again"
+      "label": "put Resolume back on the Service deck, then look at the columns again"
     },
     "ready_copy_tracks": {
       "kind": "ready",
@@ -1345,7 +1345,7 @@
     "lineup_skip_positions": [],
     "resolume_url": "http://10.1.10.206:8080",
     "resolume_deck": "Service",
-    "led_clip": "",
+    "prop_host": "prop",
     "prop_bundle_host": "prop",
     "prop_bundle_folder": "~/Library/CloudStorage/GoogleDrive-media@waterschurch.org/Shared drives/Location Assets/ProPresenter",
     "prop_bundle_pattern": "*.probundle",