feat: introduce bootloader-agnostic Boot Contract, add btlist command to list connected Bluetooth devices

programs/src/btlist/main.cpp

@@ -0,0 +1,36 @@
+/*
+    * main.cpp
+    * uses the bt_list syscall to output a list of connected Bluetooth devices.
+    * Copyright (c) 2026 Daniel Hammer
+*/
+#include <montauk/syscall.h>
+#include <libc/stdio.h>
+
+const char* addr_to_string(char* str, uint8_t* bdAddr) {
+    snprintf(str, 18, "%02x:%02x:%02x:%02x:%02x:%02x",
+        bdAddr[0], bdAddr[1], bdAddr[2], bdAddr[3], bdAddr[4], bdAddr[5]
+    );
+
+    return (const char*)str;
+}
+
+extern "C" void _start() {
+    montauk::abi::BtDevInfo devices[64] = { };
+    int n = montauk::bt_list(devices, 64);
+
+    if (n <= 0) {
+        montauk::print("No Bluetooth devices are currently connected. For a list of paired devices, use 'btbonds'.\n");
+        montauk::exit(0);
+    }
+
+    montauk::print("  MAC addr.           Encrypted\n");
+
+    for (int i = 0; i < n; i++) {
+        char macAddrString[18] = {};
+        addr_to_string(macAddrString, devices[i].bdAddr);
+
+        printf("  %-17s   %s\n", macAddrString, devices[i].encrypted ? "True" : "False");
+    }
+
+    montauk::exit(0);
+}