Kikobeats / superlock

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fix: treat null signal as no cancellation under contention (#24)

* fix: treat null signal as no cancellation under contention

Passing null as the AbortSignal under contention took the abortable
queue path (signal !== undefined), so addEventListener threw after the
waiter was enqueued. That left a zombie whose acquire() also threw on
release, rejecting successful withLock work and letting later acquirers
jump the FIFO queue.

Treat null like undefined, and unlink the waiter if subscribe throws.

* refactor: reject a malformed signal before enqueueing

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MTbj6CYXGsk6rhXx7J8SUP

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Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Kiko Beats <josefrancisco.verdu@gmail.com>
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

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