fix: fix Bluetooth shutdown delay with no active connections

kernel/src/Api/BuildNo.hpp

@@ -12,4 +12,4 @@
 
 #pragma once
 
-#define MONTAUK_BUILD_NUMBER 64
+#define MONTAUK_BUILD_NUMBER 66

programs/src/login/login_shutdown.cpp

@@ -143,6 +143,23 @@ bool run_stage(void (*fn)(), uint64_t timeout_ms) {
     return false;
 }
 
+// True only if there is Bluetooth work to do: an adapter is present and at
+// least one device is connected. bt_info/bt_list are non-blocking table reads
+// that return immediately when no adapter exists (e.g. under QEMU), so this
+// gate is effectively free.
+bool bluetooth_has_active_connection() {
+    Montauk::BtAdapterInfo adapter;
+    if (montauk::bt_info(&adapter) != 0 || !adapter.initialized) {
+        return false;  // no adapter
+    }
+    Montauk::BtDevInfo devs[8];
+    int n = montauk::bt_list(devs, 8);
+    for (int i = 0; i < n; i++) {
+        if (devs[i].connected) return true;
+    }
+    return false;
+}
+
 // Stage bodies -- no captured state, so they double as bare thread entries.
 void stage_disconnect_bluetooth() {
     Montauk::BtDevInfo devs[8];
@@ -165,12 +182,16 @@ void perform_graceful_shutdown(LoginState* ls, int action) {
     const char* heading = rebooting ? "Restarting" : "Shutting Down";
 
     // ==== Stage 1: disconnect connected Bluetooth devices ====
-    // Bounded so an unresponsive controller cannot block the (critical)
+    // Skip entirely when there is no adapter or nothing connected, so a typical
-    // filesystem flush that follows.
+    // shutdown (and every QEMU run) does not pay for an empty stage. When there
+    // is work, it is bounded so an unresponsive controller cannot block the
+    // (critical) filesystem flush that follows.
+    if (bluetooth_has_active_connection()) {
         show_stage(ls, heading, "Disconnecting Bluetooth devices...");
         if (!run_stage(stage_disconnect_bluetooth, BT_STAGE_TIMEOUT_MS)) {
             show_stage(ls, heading, "Bluetooth is unresponsive, continuing...");
         }
+    }
 
     // ==== Stage 2: flush writes and unmount filesystems ====
     show_stage(ls, heading, "Flushing file systems...");

programs/src/whoami/main.cpp

@@ -17,5 +17,6 @@ extern "C" void _start() {
     montauk::print((const char*)username);
     montauk::print("\n");
 
+
     montauk::exit(0);
 }