LongHorizon-Harness proposes Manage-Execute-Audit loop for long-horizon agents

Proposes a Manage-Execute-Audit (MEA) loop that separates task-state tracking from execution, using a manager to hold verified task state, a fresh-context executor per subtask, and a read-only auditor to check environment state before each new round. Reported gains include Qwen 3.7-Plus rising from 51.8% to 80.7% on WeaveBench and Claude Opus 4.7 rising from 20.0% to 34.3% on an OSWorld 2.0 subset.