/**
 * SyntheticWalkCycleEngine — procedural walk-cycle implementation of MotionMatchingEngine.
 *
 * NOT a neural network. NOT trained. Hand-crafted sin-wave biped gait that
 * produces a deterministic, license-clean walk cycle. Useful as:
 *   - Testing fixture for the runtime wrapper (visible motion in unit tests
 *     without needing trained weights or a real ONNX backend).
 *   - License-clean training-data generator — emits TrainingFrames that the
 *     real BUILD-1 NN can learn from (procedural-to-neural distillation).
 *   - Studio demo content while the real engine is in development.
 *
 * Explicitly NOT a substitute for the real neural inference (BUILD-1
 * follow-up per /founder ruling 2026-04-26 — primary-literature
 * reimplementation). Named "synthetic" so the trait surface stays honest:
 * a future @stub-audit run that finds this engine knows it's intentional
 * scaffolding, not a stubbed-real-thing.
 */
import { type MotionInferenceInput, type MotionInferenceResult, type MotionMatchingEngine } from './motion-matching';
/** Joint names this engine drives — matches a generic biped rig. */
export declare const SYNTHETIC_WALK_JOINTS: readonly ["hip", "left_thigh", "right_thigh", "left_knee", "right_knee", "left_foot", "right_foot"];
/**
 * Build a biped pose at a given phase + speed. Pure function — same inputs
 * always produce the same pose. No timestamp in the joint values themselves
 * (timestamp is set by the engine on the SkeletonPose wrapper).
 */
export declare function buildSyntheticBipedPose(phase: number, speed: number): Record<string, {
    position: [number, number, number];
    rotation: [number, number, number, number];
}>;
export declare class SyntheticWalkCycleEngine implements MotionMatchingEngine {
    readonly modelId: string;
    loaded: boolean;
    constructor(modelId?: string);
    load(): Promise<void>;
    infer(input: MotionInferenceInput): MotionInferenceResult;
    dispose(): void;
}
export declare function createSyntheticWalkCycleEngine(modelId?: string): MotionMatchingEngine;