# Track Specification: Advanced Tier 4 QA Auto-Patching

## Overview
Elevate Tier 4 to auto-patcher with .patch file generation and diff viewer.

## Current State Audit
### Already Implemented
- Tier 4 log analysis
- Error detection in tests

### Gaps to Fill
- No .patch generation
- No GUI diff viewer

## Goals
- Tier 4 generates .patch on test failure
- Side-by-side diff viewer in GUI
- Apply patch button

## Functional Requirements
- .patch file generation
- Diff computation
- Patch application

## Non-Functional Requirements
- Safe patch preview before apply
- Rollback capability