Stream Execution

Stream execution updates using Server-Sent Events (SSE). This endpoint combines two sources for real-time updates: 1. Redis streaming events (from worker activities) - sub-second latency 2. Temporal workflow queries (for state consistency) - 200ms polling The Redis events provide instant tool execution updates, while Temporal ensures we never miss state changes even if Redis is unavailable. SSE format: - data: {json object with execution status, messages, tool calls} - event: status|message|tool_started|tool_completed|error|done