test: unify Wi-Fi and Bluetooth installation

tests/unified-wifi-bt/README.md

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+# Unified Wi-Fi and Bluetooth branch test
+
+This branch tests replacing the separate `main` and `bluetooth` branches with
+one driver and installer. The kernel driver, firmware, and DKMS configuration
+were already identical on both branches. This test unifies their installer,
+migration, diagnostics, packaging description, and documentation.
+
+The expected architecture is:
+
+- `aic_load_fw` initializes every supported adapter and uploads firmware.
+- `aic8800_fdrv` handles Wi-Fi.
+- A combo adapter exposes a Bluetooth HCI USB interface after initialization;
+  the standard Linux `btusb` driver binds through normal USB device matching.
+- A Wi-Fi-only adapter exposes no HCI interface and does not need `btusb`.
+- The retired custom `aic_btusb` module is never installed or used.
+
+The installer deliberately does not force-load `btusb` and does not globally
+unblock Bluetooth through rfkill.
+
+## Install
+
+```bash
+git fetch origin
+git switch test/unified-wifi-bt
+git pull --ff-only
+sudo ./install.sh
+sudo reboot
+```
+
+## Test a Wi-Fi-only adapter
+
+Confirm that:
+
+1. The Wi-Fi interface is created.
+2. Scanning, association, DHCP, and real traffic work.
+3. No `aic_btusb` module is loaded.
+4. The absence of `btusb` or an HCI controller is treated as normal.
+
+## Test a Wi-Fi/Bluetooth combo adapter
+
+Confirm that:
+
+1. Wi-Fi scanning, association, DHCP, and real traffic work.
+2. `aic_load_fw` uploads the firmware before the HCI interface is used.
+3. The Bluetooth USB interface is bound to the standard `btusb` driver.
+4. `bluetoothctl` can power on, scan, pair, and exchange real traffic.
+5. No `aic_btusb` module, alias, soft dependency, or udev binding rule remains.
+
+## Collect results
+
+```bash
+git rev-parse --short HEAD
+lsusb
+lsusb -t
+lsmod | grep -E 'aic|btusb|bluetooth'
+iw dev
+bluetoothctl list
+sudo ./diagnose_bt.sh | tee unified-wifi-bt-diagnostic.log
+sudo journalctl -k -b --no-pager | tee unified-wifi-bt-kernel.log
+```
+
+Please attach both logs and identify whether the tested adapter is Wi-Fi-only
+or a combo device.
+
+## Roll back during testing
+
+```bash
+git switch main
+git pull --ff-only
+sudo ./install.sh
+sudo reboot
+```