Check that a result-cache key contains every input that changes the result, and nothing volatile

Overview

Given the inputs of a cached computation (each declared as influencing the output or not, optionally volatile) and the list of inputs the cache key is built from, finds influential inputs missing from the key (stale or wrong hits), volatile inputs inside it (the cache never hits), unknown-influence inputs left out, and, for private results, a missing tenant dimension (cross-tenant leak). When values are given it also returns a deterministic key digest (RFC 8785 JSON + SHA-256

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