ADR-0087 exemption (no-migration-prescription): a refusal of a QUERY shape at the engine's per-aggregation filter position: the operator x declared-type pairs refused are exactly the pairs driver-sql's where has refused on a JSON-stored column since its column-type gate landed, and the per-aggregation position now answers them the same way. No authorable key, spelling or stored metadata shape moves: FilterConditionSchema, AggregationNodeSchema and every object and dataset definition parse and save as before, and nothing reads or rewrites a stored row. There is nothing for objectstack migrate meta to rewrite, since what changes is which query the engine answers, not what any metadata says; the refusal itself names the spelling to use. The other categories are closed on facts: every bumped package publishes (not unpublished); no ADR-0087 id covers a filter operator on a JSON-stored column and this diff adds none (not registered / already-registered); and the change is runtime behaviour plus ADDITIONS only (three new @objectstack/core exports and one new optional trailing parameter on applyInMemoryAggregation), with no published interface or type narrowed or removed (not runtime-interface-only / type-surface-only).