test(verifier): one spec bundler instead of four

The four differed only in which rows of the alias map they omitted, and esbuild
applies an alias only on an actual import, so the omissions were not a
difference. One bundleSpec carries what genuinely varied: an inline spec or a
path on disk, and an optional runtime entry to swap for the shipped one.

internal/verifier/setup_action_test.go

@@ -3,54 +3,19 @@ package verifier
 import (
 	"errors"
 	"maps"
-	"os"
-	"path/filepath"
 	"slices"
 	"testing"
 
-	"github.com/priyanshujain/sanderling/internal/bundler"
 	"github.com/priyanshujain/sanderling/internal/hierarchy"
 )
 
-// bundleInlineSpec bundles an inline spec through the real @sanderling/spec API
-// and goja runtime entry, so the bundle installs __sanderlingSetupAction__ the
-// way the CLI does.
-func bundleInlineSpec(t *testing.T, source string) string {
-	t.Helper()
-	dir := t.TempDir()
-	specPath := filepath.Join(dir, "spec.ts")
-	if err := os.WriteFile(specPath, []byte(source), 0o600); err != nil {
-		t.Fatal(err)
-	}
-	abs := func(rel string) string {
-		path, err := filepath.Abs(rel)
-		if err != nil {
-			t.Fatal(err)
-		}
-		return path
-	}
-	bundle, err := bundler.Bundle(bundler.Options{
-		EntryFile:   specPath,
-		RuntimeFile: abs("../../pkg/spec/src/goja-runtime.ts"),
-		Aliases: map[string]string{
-			"@sanderling/spec":                     abs("../../pkg/spec/src/index.ts"),
-			"@sanderling/spec/defaults":            abs("../../pkg/spec/src/defaults/index.ts"),
-			"@sanderling/spec/defaults/properties": abs("../../pkg/spec/src/defaults/properties.ts"),
-		},
-	})
-	if err != nil {
-		t.Fatalf("bundle: %v", err)
-	}
-	return string(bundle.JavaScript)
-}
-
 func loadBundled(t *testing.T, source, treeJSON string) *Verifier {
 	t.Helper()
 	v, err := New()
 	if err != nil {
 		t.Fatal(err)
 	}
-	if err := v.Load(bundleInlineSpec(t, source)); err != nil {
+	if err := v.Load(bundleSpec(t, bundleOptions{SpecSource: source})); err != nil {
 		t.Fatalf("load: %v", err)
 	}
 	tree, err := hierarchy.Parse(treeJSON)