Module error 

Error type and helpers. Error types and helpers for the public poolsim-core API.

PoolsimError is designed to work for both library callers and service adapters:

• stable machine-readable codes via PoolsimError::code
• optional structured error details via PoolsimError::details
• human-readable messages via Display

This makes the same error type suitable for direct Rust usage, CLI rendering, and HTTP/WebSocket translation in poolsim-web.

Enums

PoolsimError

Error type returned by poolsim-core public APIs.