Sprint 242 Plan: Profile-Driven Native Impact Remediation Loop

Goal

Automatically convert failing impact-coverage profiles into deterministic extra requirements and rerun native decomposition to attempt closure.

Step 2254: Add remediation requirement synthesizer from failing impact checks.
Step 2255: Add two-pass remediation loop wrapper (baseline -> synthesize -> rerun).
Step 2256: Add pipeline support for externally supplied extra normalized requirements.
Step 2257: Emit loop before/after delta artifact.
Step 2258: Add Sprint242IntegrationSummary.h and execution tracker.