Various performance improvements#72

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lpgauth wants to merge 8 commits intorkallos:mainfrom

lpgauth:upkeep/perf

Commits on Mar 17, 2026

Add benchee benchmark for event handler hot path
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Pre-compute metric tuples and tag functions at init time
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Store per-event data in persistent_term and track keys for cleanup
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Eliminate map lookup by using per-event persistent_term key in handler
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Resolve scheduler tid once per event instead of per metric
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Skip keep? guards when keep is nil via specialized store_metrics clauses
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Pre-bind insert function per metric to eliminate dynamic dispatch from store_metrics
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Deduplicate tag_fn calls per event via indexed tag results tuple
lpgauth
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