WorkQueue (app/queue.ts)

Generic async work queue with concurrency and superseding logic.

// Source: https://github.com/trailhq/Trail-Code | License: MIT | Copyright 2026 Context Graph Engine contributors
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/**
 * The work queue.
 *
 * A webhook must be answered in seconds, and a review takes tens of them, so the
 * HTTP handler's only job is to enqueue. Two properties matter and neither comes
 * free from a bare array:
 *
 *  - **Superseding.** Five pushes to one pull request in a minute is normal, and
 *    reviewing the first four is wasted work whose comments are immediately
 *    overwritten. A queued job for the same PR is replaced, not appended.
 *  - **A ceiling.** One repository must not be able to starve every other
 *    installation, so a fixed number of workers drain the queue.
 */

export interface Que

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