Add routing solution tracing - #86
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Expose an opt-in native trace for cold and warm routing solves. Record bounded solution improvements without Ruby callbacks or changing existing no-GVL solve paths.
erickreutz
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Long routing searches currently expose only the final assignment, so callers cannot measure when feasible and improved solutions appear. This adds an opt-in, bounded native solution trace for cold and warm routing solves.
The trace records first, best, and latest objectives and timing, aggregate solution counts, and bucketed strict improvements. Callbacks capture mutex-protected native state only; Ruby objects are created by
to_hunder the GVL, and the existing no-GVL solve paths remain unchanged.The default trace retains at most 64 samples, allocation is capped at 100,000, and an interleaved benchmark measured 0.02% median overhead.