Function updateSessionActivity

src/utils/concurrentSessions.ts:155–161

(patch: {
  status?: SessionStatus
  waitingFor?: string
})

 * transcript-tail derivation for one refresh.
 */
export async function updateSessionActivity(patch: {
  status?: SessionStatus
  waitingFor?: string
}): Promise<void> {
  if (!feature('BG_SESSIONS')) return
  await updatePidFile({ ...patch, updatedAt: Date.now() })
}

/**
 * Count live concurrent CLI sessions (including this one).