Call operations that run in a HotCell container. Register a cell, subclass HotCell::Client to name an operation, and call it with open file descriptors and a payload. Failures arrive classified as permanent or transient, as exception classes your application supplies.

Runs a HotCell container. A supervisor listens on two Unix sockets, forks a worker for each request, and enforces a wall clock deadline and resource limits on it. Write the work as a subclass of HotCell::Operation.