/**
 * @copyright Sister Software
 * @license AGPL-3.0
 * @author Teffen Ellis, et al.
 *
 *   #822 PLACER-FRONTIER PROBE (night 2026-06-28, Phase A) — for the placer-recoverable countries (a
 *   country hint resolves them, so growing the placer captures the win), measure whether the DEPLOYED
 *   coarse placer can actually emit that country. Per query (`<City>, <Country>` from cities15000):
 *
 *   - `in_class_set`  — is the true country even in the placer's class set? (a class the model can't
 *                       represent can't be recovered by any threshold change — that's a DATA gap)
 *   - `top1_correct`  — did the placer's argmax land on the true country?
 *   - `prob_1`        — the calibrated top-class confidence (vs `HARD_PLACE_COUNTRY_MIN_CONF` = 0.9)
 *
 *   Branch (plan Phase 2): `in_class_set` false >5% → DATA GAP, defer to a class-set-widening retrain.
 *   in-set + top1>80% + median prob_1 < 0.9 → UNDER-CONFIDENT, M2 mass-rule fix. in-set + top1<80% →
 *   low-quality signal, defer. The probe is a LINEAR model (no ONNX), so it is heat-safe.
 *
 *   Run: `mailwoman placer probe-frontier [--model <dir>] [--n 2000] [--out <md>]`
 */
/**
 * Options for {@linkcode probeFrontier}.
 */
export interface ProbeFrontierOptions {
    /**
     * Model artifact dir. Default: the DEPLOYED placer bundled in `@mailwoman/core` (`core/data/coarse-placer`), NOT the
     * `$MAILWOMAN_DATA_ROOT` training output — match the runtime.
     */
    model?: string;
    /**
     * Queries sampled (shortest first). Default 2000.
     */
    n?: number;
    /**
     * Also write the markdown report here.
     */
    out?: string;
}
/**
 * Result of {@linkcode probeFrontier}.
 */
export interface ProbeFrontierResult {
    /**
     * The Phase-2 branch verdict line.
     */
    branch: string;
    n: number;
    markdown: string;
}
/**
 * Coarse-placer frontier probe (#822) — see the module doc. Emits the report head to stdout.
 */
export declare function probeFrontier(options?: ProbeFrontierOptions, report?: (line: string) => void): Promise<ProbeFrontierResult>;
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