Show HN: Run Claude Code unattended inside a fence, under a dollar budget github.com

SIwithin is a macOS-only, open-source Python tool that runs Claude Code or OpenAI Codex unattended in a sandboxed set of folders, with per-run spending limits and a cost ledger. Its creator says Claude runs can route API requests through a metering proxy, while Codex budgeting is soft and its adapter has not been tested against a live CLI.