Track the stack range of each running guest thread and answer
sceKernelIsStack from the calling thread's stack (the host limits for an
adopted thread) or from that registry. A mapped address outside every
stack succeeds with null bounds and an unmapped one returns EACCES; the
output pointers may be null.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Merijn