implement "trial deletion" GC to collect cycles#407
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This moves monty from a tracing GC to a "refcounting with trial deletion" GC described in https://web.eecs.umich.edu/~weimerw/2008-415/reading/bacon-garbage.pdf
This seems to be a standard way to detect cycles without needing to actually keep a set of GC roots.
For now the implementation is vibe-coded by Claude with no review on my part. Pushing to park here for the week, will clean up & continue next week.