feat: add crash stack snapshots and context menu annotations

kernel/src/Hal/IDT.cpp

@@ -127,6 +127,21 @@ namespace Hal {
             rep.stackPointer = regs->SP;
             rep.stackSegment = regs->SS;
 
+            // An indirect CALL pushes its real continuation address before a
+            // bad target faults on instruction fetch. Preserve a small stack
+            // snapshot while the dying process address space is still active;
+            // stackWords[0] will usually identify the caller even when RIP is
+            // corrupted data and cannot itself be symbolicated.
+            constexpr uint64_t snapshotBytes =
+                CrashReport::StackSnapshotWords * sizeof(uint64_t);
+            if (Memory::VMM::Paging::IsUserRangeAccessible(
+                    proc->pml4Phys, regs->SP, snapshotBytes, false)) {
+                auto* userStack = (const volatile uint64_t*)regs->SP;
+                for (int word = 0; word < CrashReport::StackSnapshotWords; word++)
+                    rep.stackWords[word] = userStack[word];
+                rep.stackWordCount = CrashReport::StackSnapshotWords;
+            }
+
             if (i == 0x0E) {
                 // Page fault: read CR2 for faulting address
                 asm volatile("mov %%cr2, %0" : "=r"(rep.faultingAddress));