feat: ACPI parsing improvements, username in process struct + syscalls

kernel/src/Api/Process.hpp

@@ -99,4 +99,25 @@ namespace Montauk {
     static int Sys_Kill(int pid) {
         return Sched::KillProcess(pid);
     }
+
+    static int Sys_SetUser(int pid, const char* name) {
+        if (name == nullptr) return -1;
+        auto* target = Sched::GetProcessByPid(pid);
+        if (target == nullptr) return -1;
+        int i = 0;
+        for (; i < 31 && name[i]; i++)
+            target->user[i] = name[i];
+        target->user[i] = '\0';
+        return 0;
+    }
+
+    static int Sys_GetUser(char* buf, uint64_t maxLen) {
+        auto* proc = Sched::GetCurrentProcessPtr();
+        if (proc == nullptr || buf == nullptr || maxLen == 0) return -1;
+        int i = 0;
+        for (; i < (int)maxLen - 1 && proc->user[i]; i++)
+            buf[i] = proc->user[i];
+        buf[i] = '\0';
+        return i;
+    }
 };

kernel/src/Api/Syscall.hpp

@@ -178,6 +178,10 @@ namespace Montauk {
     static constexpr uint64_t SYS_SETTZ         = 90;
     static constexpr uint64_t SYS_GETTZ         = 91;
 
+    /* Process.hpp */
+    static constexpr uint64_t SYS_SETUSER       = 92;
+    static constexpr uint64_t SYS_GETUSER       = 93;
+
     static constexpr int SOCK_TCP = 1;
     static constexpr int SOCK_UDP = 2;
 
@@ -371,6 +375,12 @@ namespace Montauk {
         char     name[64];
     };
 
+    struct ThermalInfo {
+        char     name[32];          // short zone name (e.g. "THRM", "TZ00")
+        int32_t  temperature;       // tenths of degrees Celsius, or -1 if unavailable
+        uint32_t _pad;
+    };
+
     // Stack frame pushed by SyscallEntry.asm
     struct SyscallFrame {
         uint64_t r15, r14, r13, r12, rbp, rbx;   // callee-saved