KCAE.DELIVER:11 - SoTA-Echoing

Anthropic’s context-engineering account motivates selective runtime access; Gemini’s long-context documentation makes caching a serious alternative while retaining multi-item retrieval limitations. These capabilities are developed in KCAE.Profiles:3. The method adopts both as conditional means and requires actual runtime support for history or isolation claims. Requalify delivery when a model, tool-output cap, caching interface or reader population changes.