perf: add full hotspot lifecycle benchmarks#109
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What changed
Adds dedicated JMH fixtures for:
Why
The existing microbenchmarks omitted planning allocations or included fixture construction, shuffle, UUID, and lifecycle setup. Those costs obscured the production hot paths and made paired A/B decisions unreliable.
Impact
This PR changes performance-test sources only. It establishes reproducible baselines for the follow-up one-hotspot PRs and does not alter gameplay or runtime behavior.
Validation
jmhJarspotlessCheck