docs(coreapi): correct cache-TTL comment to match cachedTokenTTL
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The struct doc claimed the cache TTL "matches the foreign-session token's lifetime (5 minutes)" while cachedTokenTTL is 4m. Describe the actual expires_in-honoring, buffered behavior.
Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com Entire-Checkpoint: c6abc0aac791
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