GR13 purge: the named asks go at the first revision that leaves them, or by grants_named_purge

While no entry of the revision invokes a queue of a build seat (seat:<seat>.accept.<queue>,
read by catalogue.QueueInvoke), the part composes no named worker, and at the first such
pass it purges accept.<queue>.* of each build seat's stream and deletes the named workers,
saying each in its journal; a failed read of the catalog half purges nothing. Its account
alone is granted the stream's purge and the named workers' delete. The hand tool
grants_named_purge records its hand act first, then asks the process to do it.

Builds: design 47 G §544, §600, §601, A-231

Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h

modules/mesh-grants/module.json

@@ -84,7 +84,8 @@
     "grants_seat_list",
     "grants_seat_list_again",
     "grants_callers",
-    "grants_why_refused"
+    "grants_why_refused",
+    "grants_named_purge"
   ],
   "state": [
     {