Function ensureSystemReminderWrap

src/utils/messages.ts:1797–1817

* Ensure all text content in attachment-origin messages carries the * wrapper. This makes the prefix a reliable discriminator * for the post-pass smoosh (smooshSystemReminderSiblings) — no need for every * normalizeAttachmentForAPI case to remember to wrap. * * Idempotent: alr

(msg: UserMessage)

 * Idempotent: already-wrapped text is unchanged.
 */
function ensureSystemReminderWrap(msg: UserMessage): UserMessage {
  const content = msg.message.content
  if (typeof content === 'string') {
    if (content.startsWith('<system-reminder>')) return msg
    return {
      ...msg,
      message: { ...msg.message, content: wrapInSystemReminder(content) },
    }
  }
  let changed = false
  const newContent = content.map(b => {
    if (b.type === 'text' && !b.text.startsWith('<system-reminder>')) {
      changed = true
      return { ...b, text: wrapInSystemReminder(b.text) }
    }
    return b
  })
  return changed
    ? { ...msg, message: { ...msg.message, content: newContent } }
    : msg
}

/**
 * Final pass: smoosh any `<system-reminder>`-prefixed text siblings into the