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

kernel/src/Sched/Scheduler.cpp

@@ -90,6 +90,7 @@ namespace Sched {
             processTable[i].userStackTop = 0;
             processTable[i].heapNext = 0;
             processTable[i].args[0] = '\0';
+            processTable[i].user[0] = '\0';
             processTable[i].runningOnCpu = -1;
             processTable[i].killPending = false;
             processTable[i].waitingForPid = -1;
@@ -283,6 +284,23 @@ namespace Sched {
             proc.args[i] = '\0';
         }
 
+        // Inherit user string from parent, or default to "system" if no parent
+        {
+            auto* cpu = Smp::GetCurrentCpuData();
+            int parentSlot = cpu->currentSlot;
+            if (parentSlot >= 0) {
+                int i = 0;
+                for (; i < 31 && processTable[parentSlot].user[i]; i++)
+                    proc.user[i] = processTable[parentSlot].user[i];
+                proc.user[i] = '\0';
+            } else {
+                // Spawned from kernel (no parent process) - set to "system"
+                proc.user[0] = 's'; proc.user[1] = 'y'; proc.user[2] = 's';
+                proc.user[3] = 't'; proc.user[4] = 'e'; proc.user[5] = 'm';
+                proc.user[6] = '\0';
+            }
+        }
+
         proc.redirected = false;
         proc.parentPid = -1;
         proc.outBuf = nullptr;

kernel/src/Sched/Scheduler.hpp

@@ -43,6 +43,7 @@ namespace Sched {
         uint64_t userStackTop;    // User-space stack top
         uint64_t heapNext;        // Simple bump allocator for user heap
         char args[256];           // Command-line arguments (set by parent via Spawn)
+        char user[32];            // Owner user name (inherited from parent on spawn)
 
         int runningOnCpu;         // CPU index running this process (-1 if not running)
         bool killPending = false; // Set by Sys_Kill when target is running on another CPU