Status: IN
The solution taxonomy is both closed (three strategies exhaust the problem space) and structurally partitioned (two pipeline forms instantiate all preprocessing-dependent strategies), meaning every solution is classifiable by exactly one strategy choice and at most one pipeline shape.
Closure (three-strategies) plus partition (two-instantiations) jointly imply a finite, enumerable classification scheme — stronger than either alone
Depends on (SL): three-strategies-cover-solution-taxonomy, canonical-pipeline-has-exactly-two-instantiations