fix(cache): eliminate TOCTOU race in InMemoryEntityCache.cacheNewEntry#4

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Copilot wants to merge 3 commits intomainfrom

copilot/implement-race-condition-fixes

Commits on Mar 10, 2026

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fix(cache): eliminate TOCTOU race in cacheNewEntry by capturing old value atomically within merge

Copilot
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machov
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ref: add link to original issue apache/polaris#761 in cacheNewEntry comment

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machov
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