/**
 * Tests for GraphQLClientImpl.
 *
 * Validates:
 * - The proto request built by query()/mutation() matches the
 *   graphql.v1.Plugin shape expected by the orchestrator.
 * - Optional per-request headers are forwarded as the proto's repeated
 *   `headers` field (key/value Property entries) so dynamic values like
 *   Authorization tokens can be sent from API code.
 * - Variables are serialized into the proto `custom.variables` Property.
 * - Trace metadata is passed through to the executeQuery callback.
 * - Response Zod validation throws RestApiValidationError on mismatch.
 */
export {};
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