hex-execute

Tiered multi-agent execution orchestrator — implements an approved hex-plan artifact (or a free-text task) through contract-first TDD (stub, specify, implement, bounded review-fix loop), then commits. Runs file-disjoint work packages in parallel git worktrees and merges onto a feature branch in serialized topological order. Use to execute, implement, build, or run an approved plan, resume an interrupted execution,…