The SessionBridge only forwarded text_delta and system_event types.
All tool_execution_*, agent_start, and turn_end events from the Pi
process were silently dropped, so the user saw a blank session even
though the agent was actively running (calling tools, querying the DB).
Forward:
- tool_execution_start/end as info events (visible in stepMessages)
- agent_start, turn_end as system_event (lifecycle tracking)
Also: log Pi stderr instead of draining silently, for debugging.
User
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