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

internal/compose/resolution/handed_pulled_in_test.go

@@ -0,0 +1,55 @@
+package resolution
+
+import (
+	"strings"
+	"testing"
+
+	mcat "git.novox.be/novox/mesh-sdk/go/catalogue"
+)
+
+// pulledInBy is a module that requires what raw's module provides, so resolving it alone pulls that module in.
+const pulledInBy = `{"module":"desk","version":"1","requires":["pulled-in-here"]}`
+
+// providing is raw's module providing what desk requires.
+func providing(raw string) string {
+	return strings.Replace(raw, `"version":"1",`, `"version":"1","provides":[{"name":"pulled-in-here"}],`, 1)
+}
+
+// onWorkstation resolves m on the workstation either assigned beside desk, or pulled in by desk alone.
+func onWorkstation(t *testing.T, m mcat.Manifest, assigned bool) mcat.Resolution {
+	t.Helper()
+	desk, err := decodeForTest([]byte(pulledInBy))
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := []string{"desk"}
+	if assigned {
+		want = append(want, m.Module)
+	}
+	r, err := Resolve(shelf(m, desk), want, workstation(), mcat.World{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	why := map[bool]string{true: "assigned", false: "required by desk"}[assigned]
+	if r.Because[m.Module] != why {
+		t.Fatalf("%s is on the workstation because %q, want %q", m.Module, r.Because[m.Module], why)
+	}
+	r.Account = "op"
+	return r
+}
+
+// What requires a module pulled in is said by name, for its value in the assignments mirror; nothing for one
+// assigned.
+func TestAPulledInModuleSaysWhatRequiresIt(t *testing.T) {
+	m := held(t, providing(notifierMoved()), builtNotifier())
+	if by := RequiredBy(onWorkstation(t, m, false), "notify"); by != "desk" {
+		t.Errorf("pulled in, notify is required by %q, want desk", by)
+	}
+	assigned := onWorkstation(t, m, true)
+	if by := RequiredBy(assigned, "notify"); by != "" {
+		t.Errorf("assigned, notify is required by %q", by)
+	}
+	if by := RequiredBy(assigned, "absent"); by != "" {
+		t.Errorf("a module not on the machine is required by %q", by)
+	}
+}