Converts a Jido/ReAct turn into Gralkor's canonical message shape.

Gralkor accepts a flat list of %Gralkor.Message{role, content} where role ∈ {"user", "assistant", "behaviour"}. Adapter responsibility:

• render the Jido ReAct event trace into "behaviour" messages using whatever textual form reads well for distillation;
• filter events that aren't memory-worthy.

The user_query passed in is expected to be the user's actual words — not enriched with memory blocks, identity envelopes, or any other harness-injected context. In the hexagonal split, prompt-time enrichment belongs in a Jido.AI.Reasoning.ReAct.RequestTransformer that wraps context for the LLM but leaves :query alone, so downstream state (buffer, request store, capture) never carries injected junk.

The server never branches on interior structure — only on role. The LLM is forgiving about the exact behaviour wording, so the rendering here is free to evolve.