Firmware r4 for ./build.sh (everything the kernel's drivers ask for)

Same layout as v34, but built from every firmware name the shipped kernel modules request (MODULE_FIRMWARE) plus the families whose names are built at run time: AMD GPUs (amdgpu), Realtek Ethernet/USB-Ethernet (rtl_nic: r8169, r8152), all Realtek Wi-Fi/Bluetooth (rtw88, rtw89, rtl_bt), Qualcomm Wi-Fi/Bluetooth (ath10k, ath11k, ath12k WCN7850, qca), Broadcom/Cypress, MediaTek Wi-Fi/Bluetooth, Intel Xe GPU, Intel ISH, all Cirrus amplifier tuning, and the WHENCE link names (e.g. intel/ibt-0040-1050). linux-firmware 12dfe670, sof-bin 2026.09.2. Kernel modules stay in v32. ./build.sh fetches this automatically.