The store keeps what the records name (hq ADR 0189)

The mesh names what may go from its own build records — a digest it did not
record making is never named, which is what keeps the sweep away from the
images genesis pushed. An artifact stays because a definition the mesh holds
names it, or because it belongs to one of the five most recent successful
builds of its module.

internal/artifacts asks the store to let go of one; internal/inventory
decides and remembers (migration 0055); the sweep runs after a build the mesh
recorded, which is when both the bytes and the keep set moved. Never fatal to
a build.

And the manifest side of while-stopped, refused from the definition alone:
no schedule, run-once, a container the module does not declare, itself.

cmd/mesh-controller/build.go

@@ -558,6 +558,10 @@ func takeIn(ctx context.Context, inv *inventory.Inventory, result link.BuildResu
 		}
 		return manifest, kept, err
 	}
+	// The keep set just moved, and new bytes just landed (novox/hq ADR 0189). Asked here rather
+	// than on a timer of its own: this is the only moment either is true. Never fatal — the build
+	// worked and the module is registered.
+	collect(ctx, inv)
 	return manifest, kept, nil
 }