Fix 10: the node-build-image acting-rule test lives beside the other hand-written tests; the pipeline's go.mod drops an unused require

Item 3: seatgen -check no longer names go/seats/nodebuildimage/acts_test.go (not written by the generator); the
test moves to the domain SDK's buildstep, which already reads the build seats' definitions. mesh-delivery-pipeline
no longer imports meshmoduleassigner.

Builds: design 47 G §324, §397

Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h

modules/mesh-delivery-pipeline/go.mod

@@ -9,7 +9,6 @@ require (
 )
 
 require (
-	git.novox.be/novox/mesh-contracts/go/seats/meshmoduleassigner v0.0.0-00010101000000-000000000000
 	git.novox.be/novox/mesh-contracts/health-and-repair/go/clients/meshhandactsclient v0.0.0-00010101000000-000000000000
 	git.novox.be/novox/mesh-contracts/health-and-repair/go/seats/meshconditions v0.0.0-00010101000000-000000000000
 	git.novox.be/novox/mesh-delivery/contracts/go/clients/meshcatalogclient v0.0.0-00010101000000-000000000000

sdk/buildstep/seat_acts_test.go

@@ -1,4 +1,4 @@
-package nodebuildimage
+package buildstep
 
 import (
 	"encoding/json"
@@ -8,7 +8,7 @@ import (
 
 // The seat's `build` acting rule matches an artifact by its kind, an image having no language (design 47 G §324, §397).
 func TestTheSeatsBuildRuleActsOnTheKindImage(t *testing.T) {
-	raw, err := os.ReadFile("../../../seats/node-build-image/seat.json")
+	raw, err := os.ReadFile("../../contracts/seats/node-build-image/seat.json")
 	if err != nil {
 		t.Fatal(err)
 	}