Module mock 

Deterministic mock backend used by tests and by the daemon’s M1 echo milestone.

Configurable knobs cover the failure modes adapters must support:

• ready flag toggles Backend::ready() for testing the listener-gate invariant (THREAT_MODEL.md F-13).
• pre_stream_error causes generate() to return GenerateError before yielding any tokens.
• mid_stream_drop_after truncates the stream after N tokens (no Done event) to exercise the mid-stream failure path.

Structs

Mock

Deterministic test backend.

MockConfig

Configuration for Mock failure-mode injection.

Enums

MockError

Variants for MockConfig::pre_stream_error.