1@README.md
2
3- Policy only: no I/O, no runtime, `forbid(unsafe_code)`.
4- New retry or error behaviour gets a virtual-time test in
5  `src/client/tests.rs` first; they are exact and instant.
6- `nothing_billed` is what a spend guard trusts to release a hold. Widen it
7  only for a failure that provably reached no server.