perf(core): eliminate backing state allocation in derive and select#109
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) Replace the internal createState in createDerive and createSelect with a direct value slot and a subscribers Set for downstream tracking. This halves the per-signal memory footprint by removing one full state allocation (subscribers Set, stateId Symbol, closures) per instance. Also eliminates the unnecessary notification cycle on first lazy read, since no external subscriber can exist yet at that point. Benchmarked: ~26% faster derive allocation, ~15% faster select allocation (10k signals).
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Closes #73
Summary
createStateincreateDeriveandcreateSelectwith a direct value slot and aSet<Subscriber>for downstream trackingsubscriberDependenciesBenchmark
10k signal allocation:
Test plan