emitWorkflowEvent's catch rendered the thrown value with a bare
String(error), which itself throws when the value's toString /
Symbol.toPrimitive throws — breaking the documented containment
guarantee: such a listener could fail the run mid-emit, starve later
listeners, and turn the detached workflow/end settle hook into an
unhandled rejection. Render through a local total fallback instead
(String in a try, a fixed label when even coercion throws); local
because the seam sits below every engine and cannot import an engine's
renderer. Regression: a listener throwing a coercion-trap value — the
emit does not propagate and later listeners still run.
imccyu
4a15c8a479