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The mechanism already existed. A question whose evidence vector says no sink of its family is in reach cannot produce a flow, and tier-zero pruning defers it. That was switched off for the whole scan whenever any of twelve degradation reasons appeared, and a multi-language repository always carries two of them, so the measured plugin arbitrated every question it could ask. Third instance this week of one blast radius, and the invariant written into the design on Monday named it. A prune blocker that names a partition now withholds pruning from that partition questions and from nobody else. cross_partition_semantics_unresolved leaves the blocker set entirely, for the reason it left the integrity gaps: a PHP family sink is PHP, so a second language cannot be why its vector saw none. Measured on Paid Memberships Pro. At 25 regions arbitration falls from 127 questions to 34 with 93 recorded deferred as tier_zero, and 19 findings before and after, identical family by family. At 500 it falls from 2,526 to 406 with 2,120 deferred. It is not sufficient, and that is the useful half. The 500-region run still fails in the same way at the same cost, because 406 questions at roughly one and a half seconds each still exceed the 300-second per-batch ceiling. This lever moved the volume; the ceiling is a separate limit. The census now records what a scan skipped and why, per family, so a cheaper scan and a narrower one stop looking identical: a family whose every question was pruned reports no sink of this family in reach rather than region offered, no question asked. 1,420 tests pass, eighteen skipped. Co-Authored-By: Claude Opus 5 (1M context) <[email protected]> Claude-Session: https://claude.ai/code/session_01EmM1j46qgKMh3zqD1QMwEo