# Resolution Summary

**Branch**: feat/181-cochange-matrix-builder -> main
**Date**: 2026-05-24
**Review**: .devflow/docs/reviews/feat-181-cochange-matrix-builder/2026-05-24_1206
**Command**: /resolve

## Statistics
| Metric | Value |
|--------|-------|
| Total Issues | 13 |
| Fixed | 13 |
| False Positive | 0 |
| Deferred | 0 |
| Blocked | 0 |

## Fixed Issues
| Issue | File:Line | Commit |
|-------|-----------|--------|
| Missing `#[must_use]` on builder `new()` and `build()` | builder.rs:50,74 | 9bf132e |
| Unchecked multiplication in `serialize()` | builder.rs:204-205 | 9bf132e |
| Unchecked addition in `serialize()` total size | builder.rs:244 | 9bf132e |
| Builder bypasses format module's `compute_checksum` | builder.rs:217-220 | 9bf132e |
| Temp file default permissions (umask-dependent) | builder.rs:255 | 9bf132e |
| Missing `#[must_use]` on reader `open()`, `pair_count()`, `jaccard()` | reader.rs:62,119,137 | 9bf132e |
| Unchecked arithmetic in reader slice helpers | reader.rs:219,225-226 | 9bf132e |
| Document O(n) complexity in `pairs_for_file` | reader.rs:163 | 9bf132e |
| Duplicated test helpers across builder/reader tests | builder_tests.rs:17-51; reader_tests.rs:19-53 | 75b98c5 |
| Missing test for MAX_PAIRS safety limit breach | builder_tests.rs (new) | 75b98c5 |
| Missing test for Jaccard perfect coupling (1.0) | reader_tests.rs (new) | 75b98c5 |
| Missing test for `pairs_for_file` with higher file ID | reader_tests.rs (new) | 75b98c5 |
| lib.rs doc comment missing cochange module | lib.rs:1-11 | 75b98c5 |

## False Positives
_(none)_

## Deferred to Tech Debt
_(none)_

## Blocked
_(none)_
