/**
 * Resolve the bridge ABI version (UEMCP_BRIDGE_API_VERSION) for the bridge
 * that's currently deployed into the user's project. The constant lives in
 * `Plugins/UE_MCP_Bridge/Source/UE_MCP_Bridge/Public/MCPHandlerRegistration.h`,
 * which `ue-mcp init`/`update` deploy alongside the rest of the bridge
 * source. Returns null when the header can't be located - the gate then
 * degrades to a warning rather than blocking install.
 */
export declare function readDeployedBridgeApiVersion(projectDir: string): number | null;