/**
 * Trial runner — the backend-agnostic host orchestration around a single trial.
 *
 * The planner ({@link planRun}) emits pure-data work items; this module applies
 * a {@link Backend} to one of them, owning the cross-cutting host concerns that
 * are identical regardless of where execution happens: the retry loop + rate
 * limiter, session-log lifecycle, phase fan-out, `--workspace` placement, and
 * the never-rejects mapping to a {@link TrialResult}. The relocatable core
 * (env setup → executor → grading) lives in {@link Backend.runTrial}.
 */
import type { Backend } from "../backend/types.js";
import type { TrialExecuteContext, TrialResult, TrialWorkItem } from "./plan.js";
/**
 * Run one planned work item against `backend`, applying the host orchestration.
 *
 * **Never rejects.** Runtime errors surface as
 * `TrialResult { status: "error", error }` so one trial's failure doesn't
 * discard siblings under concurrent admission.
 */
export declare function runTrialItem(item: TrialWorkItem, backend: Backend, ctx: TrialExecuteContext): Promise<TrialResult>;
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