Boot KVM guests via UEFI by default; per-image firmware setting

Run 5 on the real host bisected the guest hang: the Debian 13 image
hangs after GRUB under SeaBIOS with or without our seed and with either
CPU model, and boots under OVMF. The image's legacy boot chain is the
problem, not the provider.

images.<key>.firmware is "uefi" (default) or "bios". The domain XML
emits <os firmware="efi"> with secure boot off, so libvirt selects the
OVMF binary and manages the NVRAM file, which the existing nvram undefine
flag removes. Direct-URL images default to UEFI too. OVMF joins the
hypervisor prerequisites; sample, config table, known gaps, decision log
and the execution log record the finding.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

internal/provider/kvm/image.go

@@ -22,10 +22,11 @@ import (
 // imageSource is a resolved placement.image: either an entry from the
 // provider's images map (Key set) or a URL given directly.
 type imageSource struct {
-	Key    string
-	URL    string
-	SHA256 string
-	Format string
+	Key      string
+	URL      string
+	SHA256   string
+	Format   string
+	Firmware string
 }
 
 // resolveImage maps placement.image to a source. Anything that is neither a
@@ -33,11 +34,11 @@ type imageSource struct {
 // surface, not retry.
 func resolveImage(cfg provider.KVMConfig, image string) (imageSource, error) {
 	if img, ok := cfg.Images[image]; ok {
-		return imageSource{Key: image, URL: img.URL, SHA256: img.SHA256, Format: img.Format}, nil
+		return imageSource{Key: image, URL: img.URL, SHA256: img.SHA256, Format: img.Format, Firmware: img.Firmware}, nil
 	}
 	u, err := url.Parse(image)
 	if err == nil && (u.Scheme == "http" || u.Scheme == "https") && u.Host != "" {
-		return imageSource{URL: image, Format: formatQcow2}, nil
+		return imageSource{URL: image, Format: formatQcow2, Firmware: firmwareUEFI}, nil
 	}
 	return imageSource{}, fmt.Errorf("%w: placement.image %q is neither a key in kvm.images nor an http(s) URL",
 		provider.ErrPermanent, image)