feat: graphing in MTK toolkit, kernel exposes CPU time, Processes app Performance tab

kernel/src/Sched/Scheduler.hpp

@@ -42,6 +42,7 @@ namespace Sched {
         uint64_t stackBase;       // Bottom of allocated kernel stack (lowest address)
         uint64_t entryPoint;
         uint64_t sliceRemaining;  // Milliseconds left in current time slice
+        uint64_t cpuTimeMs;       // Accumulated scheduler runtime in milliseconds
         uint64_t pml4Phys;        // Physical address of per-process PML4
         uint64_t kernelStackTop;  // Top of kernel stack (for TSS RSP0 / SYSCALL)
         uint64_t userStackTop;    // User-space stack top