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`dl-set-strategy!` accepted any keyword silently — typos like `:semi_naive` or `:semiNaive` were stored uninspected and the saturator then used the default. The user never learned their setting was wrong. Validator added: strategy must be one of `:semi-naive`, `:naive`, `:magic` (the values currently recognised by the saturator and magic-sets driver). Unknown values raise with a clear message that lists the accepted set. 1 regression test; conformance 276/276. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>