Judge the controller's module check against the catalogue it is released with, captured at the group's catalogue head f3a57dcc, so a group that brings a word the trunk's catalogue lacks does not fail on the trunk (issue 774)

The release's fourth check failed TestModuleCheckPassesTheCatalogue with 27 problems. The checker clones the catalogue
beside a controller's tests at its trunk, even in a group holding a catalogue pull request (mesh-delivery checker
internal/check/beside.go besideFor, ADR 0484 clause 4). The release's sdk refuses an offer stating no credential form,
and the trunk's catalogue states none until the release's catalogue merges.

- Quick fix (not chosen): recapture alone, which the test never reads while MESH_CHECK_BESIDE is set.
- Chosen: the test reads the captured copy, now at the group's catalogue f3a57dcc, through beside.CapturedDir. Every other
  beside test still reads the clone. The check itself is unchanged: every rule, every manifest. Moving CAPTURED to the
  catalogue a change is released with is part of that change.

Run as the checker runs it (catalogue at main, mesh-host at main, mesh-sdk at the pin, mesh-controller's trunk
beside): the whole unit and integration suite passes, 1706 tests, 8 skipped. The test also passes with the catalogue at
f3a57dcc beside, and with nothing beside.

cmd/mesh-controller/check_test.go

@@ -56,9 +56,15 @@ func TestModuleCheckJudgesBetweenTheManifestsGiven(t *testing.T) {
 	}
 }
 
-// The real catalogue passes the command, the way it passes the test that used to be the only check.
+// The real catalogue passes the command, the way it passes the test that used to be the only check: the catalogue this
+// controller is released with, captured in testdata/beside at the commit CAPTURED names. Not the clone a merge check puts
+// beside, which is the catalogue's trunk even in a delivery group holding a catalogue pull request (ADR 0484 clause 4):
+// a controller whose check reads a word that group's catalogue brings would fail on the trunk's catalogue before the
+// group merges both (issue 774: the release's sdk refuses an offer that states no credential form, and the catalogue's
+// trunk states none until the release's catalogue merges). Moving CAPTURED to the catalogue a change is released with is
+// part of that change.
 func TestModuleCheckPassesTheCatalogue(t *testing.T) {
-	root := beside.Catalogue(t)
+	root := filepath.Join(beside.CapturedDir(t, "mesh-catalog"), "modules")
 	paths, err := manifestsUnder(root)
 	if err != nil || len(paths) == 0 {
 		t.Fatalf("no manifests under %s: %v", root, err)