feat(iso): add AMD Instinct MI250X/MI250 driver support

- firmware-amd-graphics: Aldebaran firmware blobs (fixes amdgpu IB ring
  test errors on MI250/MI250X at boot)
- 9001-amd-rocm.hook.chroot: adds AMD ROCm 6.4 apt repo and installs
  rocm-smi-lib for GPU monitoring (analogous to nvidia-smi)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

iso/builder/config/hooks/normal/9001-amd-rocm.hook.chroot

@@ -0,0 +1,39 @@
+#!/bin/sh
+# 9001-amd-rocm.hook.chroot — install AMD ROCm SMI tool for Instinct GPU monitoring.
+# Runs inside the live-build chroot. Adds AMD's apt repository and installs
+# rocm-smi-lib which provides the `rocm-smi` CLI (analogous to nvidia-smi).
+
+set -e
+
+ROCM_VERSION="6.4"
+ROCM_KEYRING="/etc/apt/keyrings/rocm.gpg"
+ROCM_LIST="/etc/apt/sources.list.d/rocm.list"
+
+echo "=== AMD ROCm ${ROCM_VERSION}: adding repository ==="
+
+mkdir -p /etc/apt/keyrings
+
+# Download and import AMD GPG key
+if ! wget -qO- "https://repo.radeon.com/rocm/rocm.gpg.key" \
+        | gpg --dearmor > "${ROCM_KEYRING}"; then
+    echo "WARN: failed to fetch AMD ROCm GPG key — skipping ROCm install"
+    exit 0
+fi
+
+cat > "${ROCM_LIST}" <<EOF
+deb [arch=amd64 signed-by=${ROCM_KEYRING}] https://repo.radeon.com/rocm/apt/${ROCM_VERSION} bookworm main
+EOF
+
+apt-get update -qq
+
+# rocm-smi-lib provides the rocm-smi CLI tool for GPU monitoring
+if apt-get install -y --no-install-recommends rocm-smi-lib 2>/dev/null; then
+    echo "=== AMD ROCm: rocm-smi installed ==="
+    rocm-smi --version 2>/dev/null || true
+else
+    echo "WARN: rocm-smi-lib install failed — GPU monitoring unavailable"
+fi
+
+# Clean up apt lists to keep ISO size down
+rm -f "${ROCM_LIST}"
+apt-get clean

iso/builder/config/package-lists/bee.list.chroot

@@ -43,6 +43,7 @@ qrencode
 
 # Firmware
 firmware-linux-free
+firmware-amd-graphics
 
 # glibc compat helpers (for any external binaries that need it)
 libc6