feat: add NTP; fix networking bugs/regressions

programs/include/Api/Syscall.hpp

@@ -211,6 +211,7 @@ namespace montauk::abi {
 
     // Path metadata (size, timestamps, mode). (const char* path, FileStat* out) -> 0, -1 on error/unsupported.
     static constexpr uint64_t SYS_STAT                = 152;
+    static constexpr uint64_t SYS_SETUNIXTIME         = 153;
 
     // Tunable parameters (for SYS_SDR_SETPARAM / SYS_SDR_GETPARAM).
     static constexpr int SDR_PARAM_FREQ        = 0;  // center frequency, Hz