feat: unify Bluetooth support and add ZLP quirk

tests/unified-wifi-bt/README.md

@@ -1,9 +1,10 @@
-# Unified Wi-Fi and Bluetooth branch test
+# Unified Wi-Fi, Bluetooth, and ZLP 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.
+one driver and installer. The Wi-Fi driver and firmware were already identical
+on both branches. This test unifies their installer, migration, diagnostics,
+packaging, and documentation, and adds the device-scoped ZLP fix from issue
+#63 as a third DKMS module.
 
 The expected architecture is:
 
@@ -13,6 +14,9 @@ The expected architecture is:
   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.
+- USB device `368b:8d81` autoloads `aic_zlp_quirk`, which adds
+  `URB_ZERO_PACKET` only to its Bluetooth ACL bulk OUT transfers.
+- The distribution's original `btusb.ko` is never replaced.
 
 The installer deliberately does not force-load `btusb` and does not globally
 unblock Bluetooth through rfkill.
@@ -21,7 +25,7 @@ unblock Bluetooth through rfkill.
 
 ```bash
 git fetch origin
-git switch test/unified-wifi-bt
+git switch test/unified-wifi-bt-zlp
 git pull --ff-only
 sudo ./install.sh
 sudo reboot
@@ -46,6 +50,16 @@ Confirm that:
 4. `bluetoothctl` can power on, scan, pair, and exchange real traffic.
 5. No `aic_btusb` module, alias, soft dependency, or udev binding rule remains.
 
+## Test the `368b:8d81` ZLP path
+
+In addition to the combo-adapter checks, confirm that:
+
+1. `aic_zlp_quirk` loads automatically and system `btusb` owns interfaces 0/1.
+2. `hook` reports `btusb:alloc_bulk_urb` or `usb_submit_urb`.
+3. The `injections` counter increases during Bluetooth audio traffic.
+4. AAC playback remains connected for at least one hour.
+5. Wi-Fi scan, association, and traffic remain unaffected during the test.
+
 ## Collect results
 
 ```bash
@@ -55,6 +69,7 @@ lsusb -t
 lsmod | grep -E 'aic|btusb|bluetooth'
 iw dev
 bluetoothctl list
+cat /sys/module/aic_zlp_quirk/parameters/{hook,injections} 2>/dev/null || true
 sudo ./diagnose_bt.sh | tee unified-wifi-bt-diagnostic.log
 sudo journalctl -k -b --no-pager | tee unified-wifi-bt-kernel.log
 ```