The gateway API endpoints (/api/engine/missions, etc.) call bridge
query functions that return empty results when the engine state hasn't
been initialized yet. Previously, initialization only happened lazily
on the first chat message via handle_with_engine().
Now when ENGINE_V2=true, the engine is initialized in Agent::run()
before channels start, so the self-improvement mission and other
engine state is available to gateway API endpoints immediately.
Also rename get_or_init_engine → init_engine and make it public so
it can be called from agent_loop.rs at startup.
Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>
