/**
 * Migration 090: Create supervisor_decisions table (spec 093).
 *
 * Immutable audit record of every supervisor evaluation. Mirrored into
 * the append-only activity_log (migration 064) so trust can always be
 * reconstructed.
 *
 * Indexes:
 *  - (source_event_kind, source_event_id) for "find decisions for this gate".
 *  - (supervisor_run_id) for run-scoped lookups.
 *  - (scope_type, scope_id, feature_id, created_at) for scoped audit queries.
 */
import type { MigrationParams } from 'umzug';
import type Database from 'better-sqlite3';
export declare function up({ context: db }: MigrationParams<Database.Database>): Promise<void>;
export declare function down({ context: db }: MigrationParams<Database.Database>): Promise<void>;
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