Merge pull request 'The catalogue declares the event it emits on starting' (#129) from fix/the-catalogue-declares-the-event-it-emits into main

Its runtime announces that it has just started and may have missed builds — the event the control
plane follows to replay them — and its manifest did not declare it. A module's authority on the bus
is derived from what it declares, so the publish was refused and the runtime died on start, in a
loop, with the mesh's graph never catching up.

modules/mesh-catalog/module.json

@@ -34,7 +34,8 @@
   "emits": [
     "registered",
     "upgraded",
-    "rebuild-needed"
+    "rebuild-needed",
+    "catching-up"
   ],
   "resources": [
     {