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process.prependListener now registers at the FRONT of the signal, 'exit',
and 'uncaughtException' listener lists instead of refusing: the runtime
gained scr_signal_prepend and scr_process_prepend_exit (both memmove the
existing entries down one slot), and the uncaught-exception registry
shares one prepend implementation with the append path (scr_rej_push_at).
Families with an append-only registry ('message', 'disconnect',
'unhandledRejection', 'rejectionHandled', 'warning') and
prependOnceListener still refuse rather than reordering silently.
Server.off/removeListener unregister the most recently added matching
listener from each of the server's lists (error, close/listening,
connection/secureConnection, timeout, drop) through scr_net_server_off,
releasing the callback and its once-marker; the emit forms keep their
existing lowering.
A child handle that is a `ChildProcess | undefined` field or parameter now
takes `child?.kill(...)` / `child?.on(...)`: both were gated on a
questionDotToken that the optional-chain lowering has already consumed, so
the chain-blocked check (lowerer.chainBlocked) replaces it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>