# Stage 5: Proofread

## Automated Scan Results

| Check | Ch1 | Ch2 | Ch3 |
|-------|-----|-----|-----|
| Double spaces (outside code) | ✅ None | ✅ None | ✅ None |
| Trailing spaces | ✅ None | ✅ None | ✅ None |
| Broken heading format | ✅ None | ✅ None | ✅ None |
| Double blank lines | ✅ None | ✅ None | ✅ None |
| AI-slop patterns | ✅ None | ✅ None | ✅ None |
| Orphan chapter references | ✅ None | ✅ None | ✅ None |
| Broken table columns | ✅ None | ✅ None | ✅ None |

## Manual Review

### Frontmatter
- ✅ All 3 chapters have valid YAML frontmatter (chapter, title, word_target, status, created)
- ✅ `status: draft` — will update to `edited` after this stage

### Cross-chapter References
- Ch1 → Ch2 bridge: "In the next chapter, we'll look at what actually happens when the working memory fills up" ✅
- Ch2 → Ch3 bridge: "In the next chapter, we'll cover the strategies engineers use to keep context lean" ✅
- Ch3 closes without "next chapter" reference (final chapter) ✅

### Code Block Review
- Ch1 tiktoken snippet: syntactically valid ✅
- Ch2 usage instrumentation: valid Python f-string, `200_000` numeric literal correct ✅
- Ch3 chunk_text: valid generator expression ✅
- Ch3 compress_history: valid, `summarize_messages` now annotated ✅
- Ch3 RAG snippet: valid ✅
- Ch3 ASCII diagram: no language tag, displays correctly ✅

## Status Update

No issues found in proofread stage. Updating chapter status: `draft` → `edited`.
