DLV-G1, DLV-W1: the grants part and the watchman hear mesh-broker's events on the seat's subject; the keeper is granted them

The lead's ruling of 13:0x (registry milestone): mesh-broker's events are mesh.seat.mesh-broker.event.<event> on the
shared events stream like every seat's. The grants part and the watchman consume mesh-broker.<event> and no longer hear
the bus module's own stream, which is its history for its tool. The keeper's process account is composed the seat's
event subjects, and the acknowledgement of a snapshot's chunks of each entry it keeps, which ADR 0626 §1 grants and the
composition lacked; a row holds it to no subscription of a restricted stream's subjects and no consumer of one.

Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig

modules/mesh-grants/module.json

@@ -14,9 +14,9 @@
     "mesh-conditions.condition-raised",
     "mesh-conditions.condition-cleared",
     "mesh-vault.account-issued",
-    "nats.created",
-    "nats.dropped",
-    "nats.recreated",
+    "mesh-broker.created",
+    "mesh-broker.dropped",
+    "mesh-broker.recreated",
     "mesh-delivery-assigner.views.placement",
     "mesh-delivery-assigner.views.wants",
     "mesh-delivery-indexer.views.manifests",