SoloEngine v0.3.0 Adds Checkpoint System, Message Queue, and Streaming Refactor

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SoloEngine released version 0.3.0 on June 29, 2026, introducing a checkpoint mechanism in ReActCore that intercepts execution flow at three defined stages during streaming. A new MessageQueue class enables users to queue messages while the LLM is running, with queued inputs sent automatically once the current task finishes. The update also adds real-time token estimation via tiktoken, a new SystemMessage type to display errors as separate notification bubbles, and WebSocket events to sync queue state with the frontend. The streaming architecture in react_core.py was refactored so each response yields a single block type, improving frontend handling of incremental content. Additional changes include a unified tool-call format, an autocomplete model name field, and improved reliability for execution completion detection.

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