/**
 * #97 R11 收编:两个既有 session-keyed registry({@link import("./per-task-image.js").PerTaskImageRegistry}
 * 与 {@link import("./capabilities/select-environment-tool.js").SessionEnvironmentSelection})共享的同一形
 * (delete-then-set + 容量闩逐最老 + get 吞 undefined)收编到一处——基准实现逐字取自
 * `PerTaskImageRegistry`(唯一行为变化:泛型化 value 类型)。两消费类改为持有本类的组合薄壳,自己的
 * 构造器/方法签名不变。
 */
/**
 * KEYED BY sessionId, NON-removing `get`, bounded by oldest-first eviction on overflow.
 *
 * `set` re-inserts at the tail (Map iteration order = insertion order) via delete-then-set, so a re-set
 * of an EXISTING key becomes the newest entry — the eviction below always removes the map's current
 * first key, so a key that was just re-set is the LAST to be evicted, not the first.
 */
export declare class BoundedSessionMap<V> {
    private readonly maxEntries;
    private readonly map;
    constructor(maxEntries?: number);
    /** A re-set (same key) overwrites and moves the entry to the newest position; on overflow the oldest
     *  insertion is evicted. */
    set(sessionId: string, value: V): void;
    /** `undefined` sessionId or an unregistered session both → `undefined` (non-removing read). */
    get(sessionId: string | undefined): V | undefined;
    /** [ref]:显式逐出(会话删除级联要它 —— 会话没了,它的进程内缓存条目也必须跟着没)。
     *  返回是否真删掉了一条(幂等:未登记的 session 返回 false)。 */
    delete(sessionId: string): boolean;
}
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