Core utilities shared across all lds modules.
Session lifecycle (Session, LdsState, SessionConfig, SessionError,
CoreError) lives in the sibling lds-session crate and is re-exported
here for backward compatibility — existing use lds_core::Session; etc.
continues to work unchanged.
This crate retains cross-cutting helpers that do not belong to the
session contract: binary probing (find_in_path, check_binaries,
BinaryStatus), output truncation (truncate_output), config file
handling (config module), and the in-memory log ring (log_store).