# Sprint 222 Plan: AB/Production Parity Hard Gate

## Goal
Eliminate unresolved AB-vs-production divergence in benchmark outputs.

## Steps
- Step 2149: Add strict parity gate in benchmark runner when AB path B compile/tests fail.
- Step 2150: Emit explicit `ab_consistency_blocked` signal in per-run production packet.
- Step 2151: Preserve deterministic blocked reason for parity failures.
- Step 2152: Validate on fullstack hard suite with `RUN_PROD=1`.
- Step 2153: Add `Sprint222IntegrationSummary.h`.