op is shipped as a zip rather than a tarball, so lib/fetch.sh grows an
install_zip_bin helper (unzip, falling back to python3's zipfile so
neither is a hard dependency).
Credentials for both stay per-box and out of this repo: op signs in via
`op signin` or OP_SERVICE_ACCOUNT_TOKEN, and opencode reaches the
covert-gpt gateway with the key that mcp-config/ syncs.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>