feat: add turn-level prompt caching + PostHog metrics + live API tests#10801

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sestinj wants to merge 7 commits intomainfrom

nate/prompt-caching

Commits on Feb 25, 2026

feat: add turn-level caching to systemAndTools strategy + PostHog cache metrics + live API test

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claude
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test: add battle test suite for Anthropic prompt caching scenarios

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claude
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fix: add 'as any' casts for cache_read_tokens on PromptTokensDetails

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claude
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fix: update anthropic adapter tests to expect cache_control on user messages

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claude
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fix: address review feedback - clone messages, void async, fix test loop

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claude
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fix: exclude live API tests from CI test runs

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claude
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fix: spread configDefaults.exclude in vitest config

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claude
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