Function buildConversationChain

src/utils/sessionStorage.ts:2069–2094

(
  messages: Map<UUID, TranscriptMessage>,
  leafMessage: TranscriptMessage,
)

 * @returns Array of messages from root to leaf
 */
export function buildConversationChain(
  messages: Map<UUID, TranscriptMessage>,
  leafMessage: TranscriptMessage,
): TranscriptMessage[] {
  const transcript: TranscriptMessage[] = []
  const seen = new Set<UUID>()
  let currentMsg: TranscriptMessage | undefined = leafMessage
  while (currentMsg) {
    if (seen.has(currentMsg.uuid)) {
      logError(
        new Error(
          `Cycle detected in parentUuid chain at message ${currentMsg.uuid}. Returning partial transcript.`,
        ),
      )
      logEvent('tengu_chain_parent_cycle', {})
      break
    }
    seen.add(currentMsg.uuid)
    transcript.push(currentMsg)
    currentMsg = currentMsg.parentUuid
      ? messages.get(currentMsg.parentUuid)
      : undefined
  }
  transcript.reverse()
  return recoverOrphanedParallelToolResults(messages, transcript, seen)
}

/**
 * Post-pass for buildConversationChain: recover sibling assistant blocks and