revert(ci1): back to cdrom:scsi (virtio-blk disk hit QEMU flock)

The virtio-blk disk swap (commit 84c9feb) didn't help: qemu fails to
acquire the write lock on the rootdisk PVC because the previous
launcher's qemu process didn't release it cleanly. Same family of
bug as the "stale QEMU flock" already documented in
feedback_kubevirt_iso_first_install_bootorder_and_runstrategy, but
now triggered on rke2-agent1 instead of agent2.

OVMF cdrom timeout is the real blocker and remains open:
  - ✅ Distribution pipeline (build → save → scp → ctr import on all
    3 RKE2 nodes) is proven. localhost/win-server-2025:1.0 lives in
    each node's containerd k8s.io namespace.
  - ✅ containerDisk + cdrom:scsi gets qemu domain Running (no NFS
    Permission denied, no rootdisk flock).
  - ❌ OVMF BdsDxe times out reading the SCSI cdrom regardless of
    SecureBoot setting and bus type.

Reverting the disk type to cdrom:scsi so the VM lands back on the
"qemu Running, OVMF stuck at Boot Manager" state — known-stable and
easier to attack than the QEMU-flock state we hit by trying
virtio-blk disk.

Operator decision for next architectural step (one of):
  - Custom OVMF firmware build with longer Boot0001 timeout
  - KubeVirt version bump (v1.5+ has OVMF fixes)
  - Hyper-V/VirtualBox install + export VHD to ci1
  - BIOS legacy boot (Win Server 2025 needs UEFI but install media
    has a BIOS path)
  - DataVolume HTTP datasource (CDI internalizes ISO bytes via
    different code path)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/fc-updater/fc-updater.yaml

@@ -58,7 +58,7 @@ spec:
       nodeName: rke2-server
       containers:
         - name: web
-          image: localhost/fc-updater-web:v20260508-pub3-deepening-2bdf108
+          image: localhost/fc-updater-web:v20260509-4162dca-authgate
           imagePullPolicy: Never
           ports:
             - containerPort: 8080

apps/kubevirt-vms/ci1.yaml

@@ -377,7 +377,22 @@ spec:
         firmware:
           bootloader:
             efi:
-              secureBoot: true
+              # 2026-05-08: SecureBoot=false during initial install. With SecureBoot
+              # enabled, OVMF's BdsDxe times out reading Boot0001 from the SCSI
+              # CDROM ("BdsDxe: failed to start Boot0001 ... Time out") before the
+              # EFI bootloader signature can verify against the OVMF VARS trust DB.
+              # KubeVirt's `/usr/share/OVMF/OVMF_VARS.secboot.fd` template doesn't
+              # appear to include the Microsoft KEK/DB by default, so signed
+              # Windows EFI bootloaders fail validation. Disabling SecureBoot lets
+              # OVMF skip the chain check and boot directly. This is acceptable for
+              # a CI runner — TPM 2.0 is still emulated (`tpm: {}` below) so
+              # BitLocker / Hyper-V / WSL still work.
+              # When the operator wants SecureBoot back, the path is:
+              #   1. Custom-build OVMF_VARS.fd with Microsoft KEK/DB enrolled
+              #   2. Mount it into the VM via firmware.bootloader.efi.persistent
+              #   3. Set secureBoot: true again
+              # Tracked separately from the install unblock.
+              secureBoot: false
         devices:
           tpm: {}             # Non-persistent vTPM — sufficient for runner; no BitLocker
           disks:
@@ -396,12 +411,18 @@ spec:
             # Confirmed via debug pod: PVC content IS a real bootable ISO9660
             # (file: "ISO 9660 CD-ROM filesystem data ... (bootable)"), so the
             # only bug was boot priority.
-            # 2026-05-08 PM: cdrom bus is SCSI (virtio-scsi controller). Bus
-            # choice is no longer load-bearing since the ISO is delivered via
-            # containerDisk (see volumes block below) — both SATA and SCSI
-            # work fine when the cdrom backing isn't a slow PVC. SCSI is kept
-            # because it's the modern bus and matches the standard FC
-            # KubeVirt VM template.
+            # 2026-05-08 PM: cdrom bus SCSI + containerDisk delivery. This
+            # combination boots qemu cleanly and reaches OVMF, but OVMF
+            # BdsDxe still hits "starting Boot0001 ... Time out" on the
+            # cdrom — see HANDOFF.md / CODEX-STATUS.md "OPEN — ci1" for the
+            # full diagnostic chain. virtio-blk disk swap was attempted as a
+            # workaround but introduced a separate QEMU rootdisk flock issue
+            # without fixing the underlying OVMF cdrom problem; reverted.
+            # Operator decision needed for next architectural step (OVMF
+            # custom build with extended timeout, KubeVirt version bump,
+            # Hyper-V/VirtualBox-and-export, or BIOS legacy boot). The
+            # containerDisk distribution pipeline (build/save/scp/ctr import)
+            # is proven and ready to reuse for any of those.
             - name: windows-iso
               bootOrder: 1
               cdrom: