Function withAmbientDeadline

src/common/interruptible.ts:53–64

(
  deadline: number | undefined,
  fn: () => T
)

   * A frame is created per `withTimeLimit` span, so per-frame ticking makes
   * that bound exact, at the cost of one property access.
   */
  tick?: number;
}

/**
 * How many `iteration-limit-exceeded` cancellations have been RAISED over the
 * life of the process. Monotonic; only ever compared before and after a
 * computation, to answer "did this computation give up because of
 * `engine.iterationLimit`?". An answer produced under a breached limit is
 * limit-DEGRADED — a different `iterationLimit` could produce a different
 * answer — so a memo must not freeze it (the collection-facet memo's
 * settled-only gate consumes this, exactly like `cycleDetectionCount()`).
 * Counted at the single raise site (the constructor below) rather than at the
 * scattered catch sites that convert the error to an "unknown" answer.
 */