Function notifyCompaction

src/services/api/promptCacheBreakDetection.ts:689–698

(
  querySource: QuerySource,
  agentId?: AgentId,
)

 * will naturally drop on the next call — that's not a break.
 */
export function notifyCompaction(
  querySource: QuerySource,
  agentId?: AgentId,
): void {
  const key = getTrackingKey(querySource, agentId)
  const state = key ? previousStateBySource.get(key) : undefined
  if (state) {
    state.prevCacheReadTokens = null
  }
}

export function cleanupAgentTracking(agentId: AgentId): void {
  previousStateBySource.delete(agentId)