Name the one genesis bundle in every bed and the README (hq issue 146, ADR 0331)

mesh-host now carries one genesis bundle, foundation-first-node.lock, on the bus the
mesh runs on; the NATS one it replaces is deleted. Beds that still named it would point
at a file that is gone, and the harness's rewrite for the previous broker's image
rewrote nothing.

README.md

@@ -148,10 +148,10 @@ is written down here rather than reconstructed a third time.
 # built for \"\", which is not a system it knows" — which reads like a broken bundle and is not
 # (novox/hq 04-ISSUES/146).
 export MESH_LAB_HOST_BINARY=<mesh-host>/mesh-host
-# The bundle that raises the bus the mesh runs on. The other one in that directory raises the
-# predecessor's broker and a control plane that crash-loops on a missing MESH_BUS_NATS — which
-# looks like a broken lab and is a bundle nobody moved (novox/hq 04-ISSUES/146).
-export MESH_LAB_BUNDLE=<mesh-host>/examples/foundation-first-node-nats.lock
+# The one genesis bundle, on the bus the mesh runs on (novox/hq ADR 0331). The bundle that raised the
+# predecessor's broker, and a control plane that crash-looped on a missing MESH_BUS_NATS, is gone
+# (novox/hq issue 146).
+export MESH_LAB_BUNDLE=<mesh-host>/examples/foundation-first-node.lock
 export MESH_LAB_MODULES=<mesh-controller>/examples/modules
 export MESH_LAB_BUILDER=<mesh-controller>/build/mesh-builder   # build/, which is git-ignored