/**
 * One-call completion over pi-ai's StreamFunction — the primitive every
 * fusion role, the synthesiser, and the gate validator share.
 *
 * The stream function is injectable: production passes an OpenRouter-backed
 * `models.streamSimple`, tests pass a `createFauxCore` scripted stream. No
 * provider logic lives here.
 */
import type { Api, Model, StreamFunction, Usage } from "@earendil-works/pi-ai";
export interface CompletionResult {
    text: string;
    usage: Usage | undefined;
    latencyMs: number;
}
export interface CompletionRequest {
    system: string;
    prompt: string;
}
/**
 * Run one completion and settle it. Every caller builds a FRESH Context per
 * call — this helper never accepts, stores, or reuses message history, which
 * is the mechanical root of the "never replay one model's turns as another's
 * history" invariant.
 */
export declare function complete(streamFn: StreamFunction, model: Model<Api>, request: CompletionRequest): Promise<CompletionResult>;
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