Function effective_dump_limit 

pub fn effective_dump_limit(requested: Option<usize>) -> usize

Resolve the effective doctor dump-mutations page limit: the operator’s --limit (or the default when omitted), clamped to the engine page cap [DUMP_MUTATIONS_MAX_LIMIT]. Pure + total so the clamp is unit-pinned without seeding a >1M-row log (tests/parser.rs).