# Sprint 217 Plan: Multi-file Artifact Closure Gate

## Goal
Enforce required-artifact closure contracts for multi-file tasks.

## Steps
- Step 2124: Required-artifact contract ingestion in benchmark orchestration.
- Step 2125: Strict invalidation when multi-file contract is underspecified.
- Step 2126: Summary metrics for multi-file contract invalidity.
- Step 2127: Add closure analyzer for multi-file/fullstack contracts.
- Step 2128: Add `Sprint217IntegrationSummary.h`.