Function getTranscriptStats

src/utils/attribution.ts:237–268

* Read session transcript entries and compute prompt count and memory access * count. Pre-compact entries are skipped — the N-shot count and memory-access * count should reflect only the current conversation arc, not accumulated * prompts from before a compaction boundary.

()

 * prompts from before a compaction boundary.
 */
async function getTranscriptStats(): Promise<{
  promptCount: number
  memoryAccessCount: number
}> {
  try {
    const filePath = getTranscriptPath()
    const fileSize = (await stat(filePath)).size
    // Fused reader: attr-snap lines (84% of a long session by bytes) are
    // skipped at the fd level so peak scales with output, not file size. The
    // one surviving attr-snap at EOF is a no-op for the count functions
    // (neither checks type === 'attribution-snapshot'). When the last
    // boundary has preservedSegment the reader returns full (no truncate);
    // the findLastIndex below still slices to post-boundary.
    const scan = await readTranscriptForLoad(filePath, fileSize)
    const buf = scan.postBoundaryBuf
    const entries = parseJSONL<Entry>(buf)
    const lastBoundaryIdx = entries.findLastIndex(
      e =>
        e.type === 'system' &&
        'subtype' in e &&
        e.subtype === 'compact_boundary',
    )
    const postBoundary =
      lastBoundaryIdx >= 0 ? entries.slice(lastBoundaryIdx + 1) : entries
    return {
      promptCount: countUserPromptsFromEntries(postBoundary),
      memoryAccessCount: countMemoryFileAccessFromEntries(postBoundary),
    }
  } catch {
    return { promptCount: 0, memoryAccessCount: 0 }
  }
}

/**
 * Get enhanced PR attribution text with NCode contribution stats.