Locate the ruby `cddl` gem binary for the decorrelated conformance oracle (`ir_conformance_corpus`), mirroring `cddl-matrix/verify.ts`'s `resolveRubyCddl`: an explicit `RUBY_CDDL` env pin wins (and fails LOUD if it points nowhere — a mispinned oracle must NOT silently fall back to gem discovery, or the run would probe a different validator than the operator intended); otherwise probe the gem insta
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