catalogue: the registry reference forms and ArtifactSweepSeat leave for the registry clients and the sweep seat's contract; seat-names keeps one rule's seat (S-8; issue 1966)

Resolve keeps its own address strip (kept, ADR 0155), which needs no seat name. The one seat name left is
ManifestNeeds' store holder (ADR 0632 §2), beside its rule in manifest_reads.go.

Claude-Session: https://claude.ai/code/session_01NcbgfFSnn24M3GcqttoU7i

go/testdata/seat-names.txt

@@ -1,6 +1,3 @@
-catalogue/artifact_sweep_seat.go: mesh-artifact-sweep
-catalogue/artifacts.go: container-image-registry
-catalogue/artifacts.go: oci-artifact-registry
 catalogue/environment_into.go: node-environment
 catalogue/environment_into.go: node-login-shell
 catalogue/environment_into.go: node-power
@@ -16,6 +13,7 @@ catalogue/graphical_session.go: node-login-manager
 catalogue/graphical_session.go: node-notifier
 catalogue/graphical_session.go: node-secret-service
 catalogue/graphical_session.go: node-terminal-emulator
+catalogue/manifest_reads.go: container-image-registry
 catalogue/node_resolver.go: node-resolver
 catalogue/reads.go: node-reads
 catalogue/seat_contributions.go: node-backup