v1.5.18

• Fix the compiler's LOADNIL peephole so it cannot merge across jump targets, preventing generic-for or nil expressions from reading uninitialized registers.
• Make direct xpcall catch errors and invoke message handlers consistently under DoString and API PCall.
• Clear protected-call continuation metadata when error paths discard frames, preventing stale continuations from corrupting later Go-backed calls.
• Preserve yielding Go-call continuations through tail-returned pcall wrappers and return results correctly from resumed root Go functions.
• Restore Lua upvalue capture in inspected stack frames.
• Add Wippy-shaped resumed-thread/register-pressure coverage across baseline and configured registry sizes.