Loop Supervisor

Scaffold a SUPERVISOR.md runbook that captures how to supervise a specific agent loop. A fresh agent session (or a future you) reads that file, launches or attaches to the loop in tmux, watches state files, and intervenes sparingly per a project-specific taxonomy.

The supervisor's golden rule is always the same shape: operate the harness, don't do the inner loop's work. What counts as "harness" vs "inner work" is project-specific — that's what discovery pins down.