seatgen: no seat list and no root package, definitions in any folder, seat-list-grain files generate nothing, packages with a dependency-free lock (ADR 0635 §1, ADR 0634 §8, F7; issue 1966)

Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig

modules/mesh-build-node/cmd/mesh-build-node/check_test.go

@@ -85,7 +85,6 @@ func TestAPackageWithNeitherScriptNorTypeScriptHasNoTests(t *testing.T) {
 	m, _, work = newMachine(t)
 	workspaceWith(t, work, map[string]string{
 		"module.json":               `{"module":"c","build":{"artifacts":[{"name":"ts","kind":"package","language":"typescript","paths":["ts"],"generated-from":"."}]}}`,
-		"seats/index.json":          `{"format":1,"seats":["one-store"]}`,
 		"seats/one-store/seat.json": `{"format":1,"seat":"one-store","scope":"mesh","grain":"seat-list","decision":"ADR 1","verbs":[{"name":"query","input":{"type":"object"}}]}`,
 		"go/go.mod":                 "module example.org/c/go\n", "go/stray.go": "package stray\n",
 		"ts/package.json": `{"name":"@example/c"}`, "ts/stray.ts.txt": "not written by the generator\n",

modules/mesh-build-node/cmd/mesh-build-node/generated_package_test.go

@@ -0,0 +1,61 @@
+package main
+
+import (
+	"context"
+	"path/filepath"
+	"slices"
+	"testing"
+
+	"git.novox.be/novox/mesh-catalog/modules/mesh-build-go/buildstep/seatgen"
+)
+
+// F7 (ADR 0625 §5, ADR 0634 §8): a package the seat generator wrote, with its dependency-free lock and no script, is
+// installed from that lock (npm ci) and packed (npm pack) with no build script run, as any package artifact is.
+func TestAGeneratedSeatPackageIsInstalledFromItsLockAndPackedWithoutABuild(t *testing.T) {
+	m, f, work := newMachine(t)
+	seat := `{"format":1,"seat":"one-store","scope":"mesh","grain":"whole","decision":"ADR 1","verbs":[{"name":"query","input":{"type":"object"},"answer":{"type":"object"}}]}`
+	src := t.TempDir()
+	write(t, filepath.Join(src, "seats", "one-store", "seat.json"), seat, 0o644)
+	g, err := seatgen.Load(src, "example.org/c/go", "@example/c")
+	if err != nil {
+		t.Fatal(err)
+	}
+	files, err := seatgen.Generate(g)
+	if err != nil {
+		t.Fatal(err)
+	}
+	dir := filepath.Join(work, "w1", "tree", "ts", "seats", "onestore")
+	for _, name := range []string{"package.json", "package-lock.json"} {
+		body, ok := files["ts/seats/onestore/"+name]
+		if !ok {
+			t.Fatalf("the generator wrote no %s for the seat's package", name)
+		}
+		write(t, filepath.Join(dir, name), string(body), 0o644)
+	}
+	f.effect = func(c call) {
+		if c.name == "npm" && len(c.args) > 0 && c.args[0] == "pack" {
+			dest := c.args[slices.Index(c.args, "--pack-destination")+1]
+			write(t, filepath.Join(dest, "example-c-one-store-0.1.0.tgz"), "tgz", 0o644)
+		}
+	}
+	ctx := context.Background()
+	if err := m.installDev(ctx, work, dir, "ts/seats/onestore"); err != nil {
+		t.Fatal(err)
+	}
+	p, err := m.buildAndPack(ctx, work, dir, "ts/seats/onestore", false, "")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if p.Name != "@example/c-one-store" || p.Version != "0.1.0" {
+		t.Errorf("packed %s@%s", p.Name, p.Version)
+	}
+	var ran []string
+	for _, c := range f.calls {
+		if c.name == "npm" {
+			ran = append(ran, c.args[0])
+		}
+	}
+	if !slices.Equal(ran, []string{"ci", "pack"}) {
+		t.Errorf("npm ran %v, want ci then pack and no build script", ran)
+	}
+}