data-flow: audit response cache utility
- Completed Action 2.5.1.2: Audited responseCache utility
- Created RESPONSE_CACHE_AUDIT.md with complete analysis
- Verified core functionality: GET-only caching, Cache-Control support, ETag/Last-Modified
- Documented cache configuration (5min TTL, 100 entry limit, FIFO eviction)
- Identified potential issues: Limited usage, no automatic invalidation after mutations
- Noted cache only used via deduplicatedApiClient, not main apiClient
- Provided recommendations for integration and improvements
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