Function selectFreshToReplace

src/utils/toolResultStorage.ts:675–692

* Pick the largest fresh results to replace until the model-visible total * (frozen + remaining fresh) is at or under budget, or fresh is exhausted. * If frozen results alone exceed budget we accept the overage — microcompact * will eventually clear them.

(
  fresh: ToolResultCandidate[],
  frozenSize: number,
  limit: number,
)

 * will eventually clear them.
 */
function selectFreshToReplace(
  fresh: ToolResultCandidate[],
  frozenSize: number,
  limit: number,
): ToolResultCandidate[] {
  const sorted = [...fresh].sort((a, b) => b.size - a.size)
  const selected: ToolResultCandidate[] = []
  let remaining = frozenSize + fresh.reduce((sum, c) => sum + c.size, 0)
  for (const c of sorted) {
    if (remaining <= limit) break
    selected.push(c)
    // We don't know the replacement size until after persist, but previews
    // are ~2K and results hitting this path are much larger, so subtracting
    // the full size is a close approximation for selection purposes.
    remaining -= c.size
  }
  return selected
}

/**
 * Return a new Message[] where each tool_result block whose id appears in