/**
 * The v2-construction gate, post-flip (GA task #65).
 *
 * From 2.0.0-beta.17 the row-driven v2 construction path is the
 * DEFAULT. The gate keeps two explicit opt-outs, precedence env over
 * config over default:
 *
 *   - env `SENSOR_MAP_V2=0` (or `false`) forces the v1.6.0 path — the
 *     operator's rollback lever, no config edit needed;
 *   - env `SENSOR_MAP_V2=1` (or `true`) forces v2 even over a config
 *     opt-out (the pre-flip opt-in keeps its meaning);
 *   - config `_sensorMapV2: false` (or 'false' / 0 — HB UI X sometimes
 *     yields JSON-string booleans) opts a single install out.
 *
 * `_sensorMapV2` is no longer exposed anywhere in the UI or schema; a
 * hand-authored opt-out is honored but undocumented, and the field is
 * scheduled for removal at 2.2.0 with the rest of the rollback
 * affordances.
 *
 * This replaces shadowModeEnabled(): the compare-only shadow observer
 * was retired at the flip, so the flag now gates exactly one thing —
 * which construction pipeline discoverDevices runs.
 */
export declare function v2ConstructionEnabled(opts: {
    env?: NodeJS.ProcessEnv;
    config?: Record<string, unknown>;
}): boolean;
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