4 of 6 words fully modelled (HEAT-PERCENTILES, LOOKUP-STRATEGY@/!,
SHOW-HEAT-OPTIMIZATION); REORG-BUCKETS deferred (bucket/lookup-table
structure has no vm_state counterpart); COMPARE-LOOKUPS partially --
guards and its net-zero effect on lookup_strategy modelled, the timed
FIND-loop benchmarking body deferred (same FIND gap already flagged
elsewhere).