/**
 * Migration 099: Create agent_graph_overrides table (spec 093, FR-38 ext).
 *
 * Per-agent override of the bundled LangGraph descriptor. Mirrors the shape
 * of agent_prompt_overrides (migration 098) — one row per agentType, atomic
 * replace on upsert, delete restores byte-identical bundled behaviour.
 *
 * Indexes:
 *  - unique (agent_type) — at most one active override per agent.
 */
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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