Agent-friendly dev workflow (bin/ + worktree isolation)

This skill scaffolds a bin/ task-runner that lets many copies of a project run concurrently on one machine — one per git worktree — each with its own database and port, sharing a single Postgres container. It's the contract AI agent orchestrators (Conductor and similar) want: register setup / run / cleanup once and every session gets an isolated environment for free. As a high-value side effect, tests run against a dedicated database and can never wipe your dev data.

It's modeled on GitHub's scripts-to-rule-them-all, but uses bin/ (the name script/ never caught on) and adds the worktree-isolation layer.

When this is the right tool

A project backed by Postgres where you want any of: concurrent worktree dev, orchestrator setup/run/cleanup hooks, an end to tests clobbering dev data, or a replacement for a docker-compose-just-for-local-postgres. If there's no database, most of this doesn't apply. If there's no concurrency need and tests already use a separate DB, the payoff is small.