No campus's address ships in the repo

prodcom-transcript's endpoint defaulted to 10.3.11.152:24480 — Apollo
Beach's ProdCom. A fresh install anywhere therefore came up reading AB's
comms and reported itself healthy doing it: that is exactly what the new
North Attleboro install did. The default is now blank, so a new install
says "No ProdCom server configured" (in red, as the ProPresenter modules
already do for a missing host) until someone points it at the ProdCom for
that location. Setting a host still connects as before.

The same address is out of SPEC.md's worked example, CLAUDE.md's note
about the reference app, and the prodcom-listener snapshot's config,
README and fallback — that fallback now exits with a line telling the
operator what to set, rather than throwing on an empty URL.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

modules/prodcom-transcript/module.json

@@ -1,7 +1,7 @@
 {
   "id": "prodcom-transcript",
   "name": "ProdCom",
-  "version": "1.3.0",
+  "version": "1.3.1",
   "proddash": ">=1.1.0",
   "description": "Live ProdCom transcript",
   "permissions": [
@@ -26,9 +26,10 @@
       "type": "endpoint",
       "label": "ProdCom server",
       "default": {
-        "host": "10.3.11.152",
+        "host": "",
         "port": 24480
-      }
+      },
+      "help": "The ProdCom server at THIS location — every campus has its own. Blank until you set it, so a new install never reads another campus's comms."
     },
     "apiKey": {
       "type": "password",