# Sprint 103 Plan: Verified Refactoring Patterns Library

## Context

Common adapter and migration fixes repeat. Sprint 103 codifies verified
refactoring patterns as reusable, test-backed transformations.

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## Goals

1. Define a versioned library of verified refactor patterns
2. Attach preconditions, postconditions, and risk profiles per pattern
3. Auto-suggest applicable patterns from failure taxonomy
4. Keep pattern application deterministic and auditable

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## Steps

### Step 1259: Refactor pattern schema and metadata model (12 tests)
### Step 1260: Preconditions/postconditions validator for patterns (10 tests)
### Step 1261: Pattern applicability matcher from graph context (10 tests)
### Step 1262: Deterministic pattern executor wrapper (10 tests)
### Step 1263: Pattern outcome scorer and rollback hooks (10 tests)
### Step 1264: Pattern library governance workflow (8 tests)
### Step 1265: `whetstone_list_verified_patterns` MCP tool (8 tests)
### Step 1266: `whetstone_apply_verified_pattern` MCP tool (8 tests)
### Step 1267: Pattern efficacy report artifact (8 tests)
### Step 1268: Sprint 103 integration summary + regression (8 tests)

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## Pattern Rule

- Only certified patterns may run in Stable-tier pathways by default.