feat: A2DP bluetooth audio working

kernel/src/Timekeeping/ApicTimer.cpp

@@ -17,6 +17,7 @@
 #include <Sched/Scheduler.hpp>
 #include <Drivers/Net/E1000E.hpp>
 #include <Drivers/USB/Xhci.hpp>
+#include <Drivers/USB/Bluetooth/Bluetooth.hpp>
 #include <Drivers/USB/HidKeyboard.hpp>
 
 using namespace Kt;
@@ -211,6 +212,15 @@ namespace Timekeeping {
             Drivers::USB::Xhci::ProcessDeferredWork();
         }
 
+        // Service Bluetooth inbound traffic (the headset's SDP/AVRCP queries,
+        // AVDTP commands, ACL flow-control credits) whenever a core idles.
+        // Without this, BT events are only processed while some syscall happens
+        // to be pumping a wait loop -- a peer that queries us between audio
+        // writes got silence (observed: Bose re-dialing SDP during playback,
+        // queries never answered).  Self-serializing and a cheap no-op when
+        // the adapter is down.
+        Drivers::USB::Bluetooth::ServiceEvents();
+
         if (cpu == nullptr || cpu->cpuIndex != 0 || !g_schedEnabled || g_ticksPerMs == 0) {
             // Non-BSP or pre-scheduler fallback: plain HLT keeps the LAPIC
             // timer running in C1 on hardware where MWAIT promotes to deeper