Worker-side: read and CONSUME this realm's panic stash so it can be
forwarded on the worker's own error message. Consume-once regardless of
shape validity — an unconsumed malformed stash must not linger to
mislabel a later trap, mirroring the main-thread gate's own rule.
Worker-side: read and CONSUME this realm's panic stash so it can be forwarded on the worker's own error message. Consume-once regardless of shape validity — an unconsumed malformed stash must not linger to mislabel a later trap, mirroring the main-thread gate's own rule.