F-delivery 7: the builder's old-form window steps by mesh-sdk's delivery.StepWindow

A read naming no node (an empty node_haves, the placement not read yet) closed the window for good (security
review F3, second of a kind). The window embeds delivery.WindowHeld and steps by the shared rule, named being
the placement's nodes before any is dropped. The builder's expiring keys share one state, bounds (the publish
bound of F-delivery 5 renamed), for the old-form bound next.

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

modules/mesh-delivery-builder/module.json

@@ -81,7 +81,7 @@
     { "name": "hearing", "history": 1 },
     { "name": "instances", "history": 1 },
     { "name": "old-form", "history": 1 },
-    { "name": "publish-bounds", "history": 1, "key-ttl": true },
+    { "name": "bounds", "history": 1, "key-ttl": true },
     { "name": "queues", "history": 1 },
     { "name": "reasks", "history": 1 },
     { "name": "tag-ask-bounds", "history": 1, "key-ttl": true },