catalogue: a contribution reaches the port its own machine published, from any machine

The co-located fix could not reach a grant assembled for a consumer on another
machine: ContributionsFrom never sees a port map, so the proxy was told the
workload's software port and dialled a number that machine never published. The
consumer's own assignments are fetched where the grant is built and applied
there. The same fault as 038, one node over.

Claude-Session: https://claude.ai/code/session_01LrgweAeERJYBg88c5cKDzF

cmd/mesh-control/plan.go

@@ -627,6 +627,15 @@ func grantsFor(ctx context.Context, open *stores, node string) ([]catalogue.Gran
 		if err != nil {
 			return nil, err
 		}
+		// A port in there is the consumer's software port until this. The consumer is on another
+		// machine, so the assignment that moved it is that machine's — fetched here rather than
+		// looked for in this one's, which is the whole reason the co-located fix could not reach
+		// this case (novox/hq 04-ISSUES/038, the cross-node half).
+		published, err := portsOn(ctx, inv, s.Consumer, s.ConsumerModule)
+		if err != nil {
+			return nil, err
+		}
+		values = catalogue.AtPublishedPort(values, s.ConsumerModule, published)
 		from := s.ConsumerModule
 		if !asks {
 			// That module no longer wants this. Left empty, which is what the declaration reads