Take the catalogue's composition rules into the node-engine

ADR 0593 §7: the composer with its refusals leaves mesh-sdk, so mesh-sdk
carries no composition rule. The catalogue functions only the
node-engine's composition reaches (Resolve, Resolution's Compose,
Declaration, DataItems, LeftOut, Rules and the rest, the settings,
placeholder and template refusals, the rendering helpers) are copied
with their tests into internal/compose/resolution; a method of a
mesh-sdk shape becomes a function taking it first. The composition
calls its own copies, and the captured catalogue its tests read lives
here now, shared by mesh-compose's tests.

Claude-Session: https://claude.ai/code/session_01NcbgfJ9Gum47zkFKWRaovL

cmd/mesh-compose/main_test.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"encoding/json"
 	"go/build"
-	"io/fs"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -16,41 +15,15 @@ import (
 
 	"git.novox.be/novox/mesh-sdk/go/catalogue"
 	"git.novox.be/novox/mesh-sdk/go/delivery"
+	"github.com/novox/mesh-host/internal/beside"
 	"github.com/novox/mesh-host/internal/compose"
 	"github.com/novox/mesh-host/internal/composer"
 )
 
-// captured is every manifest of the catalogue, raw, by module name: the clone beside a merge check (MESH_CHECK_BESIDE),
-// or the copy captured in testdata/mesh-catalog from mesh-sdk's testdata/beside (mesh-catalog b5dbfbb7, its
-// module.json files alone), each kept as module.json.captured so this repository holds no module of the catalogue.
+// captured is every manifest of the catalogue captured in testdata/beside (internal/beside), raw, by module name.
 func captured(t *testing.T) map[string]composer.Manifest {
 	t.Helper()
-	dir := ""
-	if root := os.Getenv("MESH_CHECK_BESIDE"); root != "" {
-		dir = filepath.Join(root, "mesh-catalog")
-	} else {
-		dir = t.TempDir()
-		from, _ := filepath.Abs("testdata/mesh-catalog")
-		err := filepath.WalkDir(from, func(path string, d fs.DirEntry, err error) error {
-			if err != nil || d.IsDir() {
-				return err
-			}
-			rel, _ := filepath.Rel(from, path)
-			into := filepath.Join(dir, strings.TrimSuffix(rel, ".captured"))
-			raw, err := os.ReadFile(path)
-			if err != nil {
-				return err
-			}
-			if err := os.MkdirAll(filepath.Dir(into), 0o755); err != nil {
-				return err
-			}
-			return os.WriteFile(into, raw, 0o644)
-		})
-		if err != nil {
-			t.Fatal(err)
-		}
-	}
-	read, err := readCatalogue(dir)
+	read, err := readCatalogue(filepath.Dir(beside.Catalogue(t)))
 	if err != nil {
 		t.Fatal(err)
 	}