A manifest HEAD says what it accepts, or the registry answers 404

The check that skips copying a base the mesh already holds asked with no Accept header, and a
registry answers a manifest only in a media type the caller named: the same digest answered 200 with
the manifest types and 404 without them. So the builder concluded it held nothing, copied every
vendor base again, and exhausted the public hub's pull limit a second time today.

The test could not have caught it, because the fake registry answered a manifest HEAD regardless of
Accept — more permissive than the thing it stands in for. It is now as strict as a real registry, and
fails without the fix.

internal/builder/mirror.go

@@ -186,7 +186,7 @@ func (r Registry) MirrorImage(ctx context.Context, from, repository string) (str
 	// on the first merge that rebuilt a whole catalogue (2026-09-28), and every module whose base
 	// lives there failed on a copy it did not need.
 	if strings.HasPrefix(where.reference, "sha256:") {
-		held, err := r.has(ctx, "http://"+r.Address+"/v2/"+repository+"/manifests/"+where.reference)
+		held, err := r.has(ctx, "http://"+r.Address+"/v2/"+repository+"/manifests/"+where.reference, manifestAccept)
 		if err != nil {
 			return "", fmt.Errorf("asking %s whether it holds %s: %w", r.Address, from, err)
 		}