cleanup: update stale comments

kernel/src/Sched/Scheduler.hpp

@@ -80,7 +80,7 @@ namespace Sched {
         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
-        uint64_t heapNext;        // Simple bump allocator for user heap
+        uint64_t heapNext;        // High-water mark of the user-heap address space
         uint32_t readdirCursor;   // Next SYS_READDIR scratch slot
         char args[4096];          // Command-line arguments (set by parent via Spawn)
         char environment[EnvironmentBytes]; // NUL-separated NAME=VALUE entries
@@ -273,8 +273,9 @@ namespace Sched {
 
     // Per-process allocated page count (tracked by Heap syscalls, separate from Process struct)
     inline uint64_t g_allocatedPages[MaxProcesses] = {};
-    // One bit per page in the bounded userspace heap. Unlike heapNext, this
-    // makes virtual ranges reusable after unmap and failed reservations.
+    // One bit per page in the bounded userspace heap. This is the authoritative
+    // allocation state; unlike heapNext, it makes virtual ranges reusable after
+    // unmap and failed reservations.
     inline uint64_t g_userHeapPageMap[MaxProcesses][UserHeapBitmapWords] = {};
 
 }