Environment Manager (em)

Controls the RF front-end chain: gain controllers, direct-conversion tuners, LPF/BPF/HPF filters, and variable-rate decimators. Runs anti-jamming algorithms to protect the receiver from intentional interference. Maintains the RFChain abstraction — the set of controllable components in a single chain — and exposes an API for the Channel Controller and other components to configure gain, filter, and decimation state per RF stream.