Function partitionByPriorDecision

src/utils/toolResultStorage.ts:649–667

* Partition candidates by their prior decision state: * - mustReapply: previously replaced → re-apply the cached replacement for * prefix stability * - frozen: previously seen and left unreplaced → off-limits (replacing * now would change a prefix that was already cached) * - fresh: ne

(
  candidates: ToolResultCandidate[],
  state: ContentReplacementState,
)

 *  - fresh: never seen → eligible for new replacement decisions
 */
function partitionByPriorDecision(
  candidates: ToolResultCandidate[],
  state: ContentReplacementState,
): CandidatePartition {
  return candidates.reduce<CandidatePartition>(
    (acc, c) => {
      const replacement = state.replacements.get(c.toolUseId)
      if (replacement !== undefined) {
        acc.mustReapply.push({ ...c, replacement })
      } else if (state.seenIds.has(c.toolUseId)) {
        acc.frozen.push(c)
      } else {
        acc.fresh.push(c)
      }
      return acc
    },
    { mustReapply: [], frozen: [], fresh: [] },
  )
}

/**
 * Pick the largest fresh results to replace until the model-visible total