Add perf profiling infrastructure, switch HXB to uncompressed storage, replace Domainslib with WorkerPool, and document compiler hotspots#77

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Copilot wants to merge 7 commits intosimn-developmentfrom

copilot/prepare-low-level-profiling-tools

Commits on Mar 15, 2026

Initial plan
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Add profile dune env for perf-instrumented builds; collect perf and --times data

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Switch HXB zip to Stored (level 0) compression; add profiling guide with perf/olly/memtrace findings

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Correct compare_val analysis: verify OCaml specialization via assembly inspection; propose Domain.spawn framework

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Use safe array access in Domain.spawn example code

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Replace Domainslib with WorkerPool: Domain.spawn + Condition.wait, zero idle CPU

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Clarify benchmark wording: primary benefit is zero idle CPU, not throughput

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